How to Use ‘Used To’ vs. ‘Would’ for Past Habits
You probably know the feeling: you understand the grammar rule when you read it, but when you speak, your brain freezes.
(You probably know the feeling: you understand the grammar rule when you read it, but when you speak, your brain freezes.)
Should you say I used to play tennis or I would play tennis?
(Should you say I used to play tennis or I would play tennis?)
And why does I would be shy as a child sound wrong, even though I would visit my grandmother every Sunday sounds fine?
(And why does I would be shy as a child sound wrong, even though I would visit my grandmother every Sunday sounds fine?)
Here’s the short answer: use used to for past habits and past states; use would only for repeated past actions, not states.
(Here’s the short answer: use used to for past habits and past states; use would only for repeated past actions, not states.)
That distinction is one of the biggest problems for ESL learners, especially if your first language uses one form like Spanish solía or French je faisais souvent.
(That distinction is one of the biggest problems for ESL learners, especially if your first language uses one form like Spanish solía or French je faisais souvent.)
Once you see the pattern clearly, the choice becomes much easier.
(Once you see the pattern clearly, the choice becomes much easier.)
At VerbPal, we teach this as a pattern family, not as two random expressions to memorise. If you can sort verbs into states and repeated actions, you make faster choices when speaking.
(At VerbPal, we teach this as a pattern family, not as two random expressions to memorise. If you can sort verbs into states and repeated actions, you make faster choices when speaking.)
The core rule: use used to for old habits and old situations
The most useful starting point is this:
(The most useful starting point is this:)
- Used to talks about something that was true regularly in the past but is not true now.
(Used to talks about something that was true regularly in the past but is not true now.) - It can describe:
(It can describe:)- Repeated actions
(Repeated actions) - States or situations
(States or situations)
- Repeated actions
1) Used to for repeated actions
This is the pattern most learners know first.
(This is the pattern most learners know first.)
- ✓ I used to drink coffee every morning.
(I used to drink coffee every morning.) - ✓ She used to walk to school.
(She used to walk to school.) - ✓ We used to visit our cousins in summer.
(We used to visit our cousins in summer.)
These are actions that happened again and again in the past.
(These are actions that happened again and again in the past.)
2) Used to for states
This is where used to becomes different from would.
(This is where used to becomes different from would.)
- ✓ I used to be very shy.
(I used to be very shy.) - ✓ He used to live in Madrid.
(He used to live in Madrid.) - ✓ They used to have a small apartment.
(They used to have a small apartment.) - ✓ We used to know that teacher.
(We used to know that teacher.)
These are not repeated actions.
(These are not repeated actions.)
They are states, conditions, or situations in the past.
(They are states, conditions, or situations in the past.)
Compare:
(Compare:)
-
✓ I used to be nervous in meetings.
(I used to be nervous in meetings.) -
✗ I would be nervous in meetings.
(I would be nervous in meetings.)
This sounds unnatural if you mean a past state in general.
(This sounds unnatural if you mean a past state in general.) -
✓ She used to live near the station.
(She used to live near the station.) -
✗ She would live near the station.
(She would live near the station.)
This is wrong for a past state.
(This is wrong for a past state.)
A good test is this: if the verb describes a condition rather than a repeated event, used to is usually the correct choice.
(A good test is this: if the verb describes a condition rather than a repeated event, used to is usually the correct choice.)
At VerbPal, this is one of the first cheat codes Lexi the dog 🐶 gives learners: old reality = used to. That pattern covers stative verbs like be, know, have, and live much more reliably than would.
(At VerbPal, this is one of the first cheat codes Lexi the dog 🐶 gives learners: old reality = used to. That pattern covers stative verbs like be, know, have, and live much more reliably than would.)
Pro Tip: If you can paraphrase the sentence as “this was true before, but not now,” used to is the safest option. Write three sentences about your past using be, have, or live.
(Pro Tip: If you can paraphrase the sentence as “this was true before, but not now,” used to is the safest option. Write three sentences about your past using be, have, or live.)
When would works: repeated past actions, often with context
Now let’s look at would.
(Now let’s look at would.)
For past habits, would can replace used to only when you are talking about repeated actions.
(For past habits, would can replace used to only when you are talking about repeated actions.)
It often appears in storytelling, memories, or descriptions of routines.
(It often appears in storytelling, memories, or descriptions of routines.)
- ✓ Every summer, we would go to the coast.
(Every summer, we would go to the coast.) - ✓ After dinner, my grandfather would tell us stories.
(After dinner, my grandfather would tell us stories.) - ✓ When I was a student, I would stay up late before exams.
(When I was a student, I would stay up late before exams.)
These sentences describe actions that happened repeatedly.
(These sentences describe actions that happened repeatedly.)
Notice that would usually sounds better when the past time is already clear:
(Notice that would usually sounds better when the past time is already clear:)
- When I was a child, I would ride my bike for hours.
(When I was a child, I would ride my bike for hours.) - On Sundays, my mother would make a big lunch.
(On Sundays, my mother would make a big lunch.)
Without context, would can sound less natural:
(Without context, would can sound less natural:)
-
? I would ride my bike for hours.
(I would ride my bike for hours.)
Possible, but it feels incomplete without a past frame.
(Possible, but it feels incomplete without a past frame.) -
✓ When I was a child, I used to ride my bike for hours.
(When I was a child, I used to ride my bike for hours.) -
✓ When I was a child, I would ride my bike for hours.
(When I was a child, I would ride my bike for hours.)
Both are correct here because ride my bike is a repeated action.
(Both are correct here because ride my bike is a repeated action.)
But not for states
This is the key distinction in used to vs. would for past habits:
(This is the key distinction in used to vs. would for past habits:)
-
✓ I used to like olives.
(I used to like olives.) -
✗ I would like olives.
(I would like olives.)
This means something different in modern English.
(This means something different in modern English.) -
✓ She used to have long hair.
(She used to have long hair.) -
✗ She would have long hair.
(She would have long hair.) -
✓ We used to live in Paris.
(We used to live in Paris.) -
✗ We would live in Paris.
(We would live in Paris.)
Why?
(Why?)
Because like, have, and live here describe states, not repeated actions.
(Because like, have, and live here describe states, not repeated actions.)
Action vs. state examples
- ✓ He used to play football after school.
(He used to play football after school.) - ✓ He would play football after school.
(He would play football after school.)
But:
(But:)
- ✓ He used to be very competitive.
(He used to be very competitive.) - ✗ He would be very competitive.
(He would be very competitive.)
Not correct for a general past state.
(Not correct for a general past state.)
There are a few advanced cases where would be can appear in narratives with a special meaning, but for learners, the rule above will keep you accurate almost all the time.
(There are a few advanced cases where would be can appear in narratives with a special meaning, but for learners, the rule above will keep you accurate almost all the time.)
In VerbPal sessions, we treat this as another pattern family: narrative routine = would, past state = used to. That kind of sorting is what helps adult learners produce the right form quickly instead of hesitating.
(In VerbPal sessions, we treat this as another pattern family: narrative routine = would, past state = used to. That kind of sorting is what helps adult learners produce the right form quickly instead of hesitating.)
Pro Tip: Ask yourself: “Is this a repeated action or a past state?” If it’s a state, choose used to, not would. To practise, rewrite four sentences from your childhood and label each verb action or state first.
(Pro Tip: Ask yourself: “Is this a repeated action or a past state?” If it’s a state, choose used to, not would. To practise, rewrite four sentences from your childhood and label each verb action or state first.)
Cheat code: used to = old reality, would = old routine. If you are describing what life was like, use used to. If you are describing what someone kept doing, would may work too.
(Cheat code: used to = old reality, would = old routine. If you are describing what life was like, use used to. If you are describing what someone kept doing, would may work too.)
Why Spanish and French speakers often mix them up
If you speak Spanish or French, this topic can feel especially confusing because your language often uses one flexible form where English uses two different patterns.
(If you speak Spanish or French, this topic can feel especially confusing because your language often uses one flexible form where English uses two different patterns.)
Spanish influence: solía
Spanish speakers often translate solía directly into either used to or would, but English is stricter.
(Spanish speakers often translate solía directly into either used to or would, but English is stricter.)
For example:
(For example:)
- Spanish: Solía jugar al tenis los sábados.
(Spanish: Solía jugar al tenis los sábados.)- ✓ I used to play tennis on Saturdays.
(I used to play tennis on Saturdays.) - ✓ I would play tennis on Saturdays.
(I would play tennis on Saturdays.)
- ✓ I used to play tennis on Saturdays.
Both work because play tennis is a repeated action.
(Both work because play tennis is a repeated action.)
But:
(But:)
-
Spanish: Solía ser tímido.
(Spanish: Solía ser tímido.)- ✓ I used to be shy.
(I used to be shy.) - ✗ I would be shy.
(I would be shy.)
- ✓ I used to be shy.
-
Spanish: Solía vivir con mis abuelos.
(Spanish: Solía vivir con mis abuelos.)- ✓ I used to live with my grandparents.
(I used to live with my grandparents.) - ✗ I would live with my grandparents.
(I would live with my grandparents.)
- ✓ I used to live with my grandparents.
So even if Spanish uses solía in both cases, English does not allow would for the state examples.
(So even if Spanish uses solía in both cases, English does not allow would for the state examples.)
French influence
French speakers often rely on the imperfect tense for both habits and states:
(French speakers often rely on the imperfect tense for both habits and states:)
- Quand j’étais petit, je jouais dehors tous les jours.
(Quand j’étais petit, je jouais dehors tous les jours.) - Quand j’étais petit, j’étais timide.
(Quand j’étais petit, j’étais timide.)
In English, those become:
(In English, those become:)
- ✓ When I was little, I used to play outside every day.
(When I was little, I used to play outside every day.) - ✓ When I was little, I would play outside every day.
(When I was little, I would play outside every day.) - ✓ When I was little, I used to be shy.
(When I was little, I used to be shy.) - ✗ When I was little, I would be shy.
(When I was little, I would be shy.)
Again, the action/state distinction matters more in English than in French.
(Again, the action/state distinction matters more in English than in French.)
Another transfer problem: overusing would
Many learners discover that would sounds advanced and natural in stories, so they start using it everywhere.
(Many learners discover that would sounds advanced and natural in stories, so they start using it everywhere.)
That creates sentences like:
(That creates sentences like:)
- ✗ I would have a dog when I was young.
(I would have a dog when I was young.) - ✗ We would know the answer.
(We would know the answer.) - ✗ She would be very quiet as a child.
(She would be very quiet as a child.)
Better versions:
(Better versions:)
- ✓ I used to have a dog when I was young.
(I used to have a dog when I was young.) - ✓ We used to know the answer.
(We used to know the answer.) - ✓ She used to be very quiet as a child.
(She used to be very quiet as a child.)
At VerbPal, we see this pattern often in active drills: learners recognise the rule when reading, but under pressure they choose would too quickly.
(At VerbPal, we see this pattern often in active drills: learners recognise the rule when reading, but under pressure they choose would too quickly.)
That’s exactly why we train active production, not just passive recognition.
(That’s exactly why we train active production, not just passive recognition.)
Pro Tip: If your first language uses one past form for both habits and states, slow down in English and classify the verb first. Make a two-column list: actions and states. Then place five verbs in the correct column.
(Pro Tip: If your first language uses one past form for both habits and states, slow down in English and classify the verb first. Make a two-column list: actions and states. Then place five verbs in the correct column.)
Negative forms: didn’t use to is the standard form
Negative forms cause a lot of hesitation because learners see different spellings:
(Negative forms cause a lot of hesitation because learners see different spellings:)
- didn’t use to
(didn’t use to) - didn’t used to
(didn’t used to)
The standard modern form is:
(The standard modern form is:)
- ✓ didn’t use to
(didn’t use to)
Examples:
(Examples:)
- ✓ I didn’t use to like coffee.
(I didn’t use to like coffee.) - ✓ She didn’t use to wear glasses.
(She didn’t use to wear glasses.) - ✓ We didn’t use to go out much.
(We didn’t use to go out much.) - ✓ He didn’t use to be so impatient.
(He didn’t use to be so impatient.)
Why use and not used?
(Why use and not used?)
Because after didn’t, the verb goes back to the base form.
(Because after didn’t, the verb goes back to the base form.)
Compare:
(Compare:)
- Positive: I used to play football.
(Positive: I used to play football.) - Negative: I didn’t use to play football.
(Negative: I didn’t use to play football.) - Question: Did you use to play football?
(Question: Did you use to play football?)
This is the same logic as:
(This is the same logic as:)
- She worked late.
(She worked late.) - She didn’t work late.
(She didn’t work late.) - Did she work late?
(Did she work late?)
Is didn’t used to ever possible?
You may see didn’t used to in informal writing or older sources.
(You may see didn’t used to in informal writing or older sources.)
Some native speakers even write it because the pronunciation can sound similar.
(Some native speakers even write it because the pronunciation can sound similar.)
But if you want the safest, clearest, most standard English, use:
(But if you want the safest, clearest, most standard English, use:)
- didn’t use to
(didn’t use to) - Did you use to … ?
(Did you use to … ?)
Negative forms with would
For past habits, negatives with would are possible, but they are less useful for most learners and often sound more literary or contextual:
(For past habits, negatives with would are possible, but they are less useful for most learners and often sound more literary or contextual:)
- When we were kids, we wouldn’t watch TV during the week.
(When we were kids, we wouldn’t watch TV during the week.)
This can work, but it may also suggest refusal in other contexts, which creates ambiguity.
(This can work, but it may also suggest refusal in other contexts, which creates ambiguity.)
For clarity, ESL learners usually do better with:
(For clarity, ESL learners usually do better with:)
- We didn’t use to watch TV during the week.
(We didn’t use to watch TV during the week.)
That is one reason used to is often the better choice in everyday English.
(That is one reason used to is often the better choice in everyday English.)
Which sentence is correct in standard English?
(Which sentence is correct in standard English?)
Pro Tip: In negatives and questions, remember the helper verb does the grammar work: did + base form. Say these aloud: I used to go, I didn’t use to go, Did you use to go?
(Pro Tip: In negatives and questions, remember the helper verb does the grammar work: did + base form. Say these aloud: I used to go, I didn’t use to go, Did you use to go?)
Common errors and how to fix them
Here are the mistakes learners make most often with used to vs. would for past habits.
(Here are the mistakes learners make most often with used to vs. would for past habits.)
1) Using would for a state
-
✗ I would be very shy at school.
(I would be very shy at school.) -
✓ I used to be very shy at school.
(I used to be very shy at school.) -
✗ They would live near us.
(They would live near us.) -
✓ They used to live near us.
(They used to live near us.) -
✗ She would have long hair.
(She would have long hair.) -
✓ She used to have long hair.
(She used to have long hair.)
2) Forgetting that would needs a repeated-action meaning
-
✗ When I was young, I would go to Paris in 2018.
(When I was young, I would go to Paris in 2018.)
This is a one-time event, not a repeated habit.
(This is a one-time event, not a repeated habit.) -
✓ When I was young, we would go to Paris every summer.
(When I was young, we would go to Paris every summer.) -
✓ In 2018, I went to Paris.
(In 2018, I went to Paris.)
3) Writing didn’t used to
- ✗ I didn’t used to understand this rule.
(I didn’t used to understand this rule.) - ✓ I didn’t use to understand this rule.
(I didn’t use to understand this rule.)
4) Confusing used to with the adjective pattern be used to
These are completely different:
(These are completely different:)
-
used to + base verb = past habit/state
(used to + base verb = past habit/state)- I used to wake up early.
(I used to wake up early.)
- I used to wake up early.
-
be used to + noun / -ing = be accustomed to
(be used to + noun / -ing = be accustomed to)- I am used to waking up early.
(I am used to waking up early.)
- I am used to waking up early.
Compare:
(Compare:)
-
✓ I used to work at home.
(I used to work at home.)
Past habit or past situation.
(Past habit or past situation.) -
✓ I am used to working at home.
(I am used to working at home.)
It feels normal for me now.
(It feels normal for me now.)
This confusion is extremely common because the forms look similar.
(This confusion is extremely common because the forms look similar.)
5) Using present-time meaning by mistake
-
✗ I use to go there every day.
(I use to go there every day.)
If you mean the past, this is wrong in an affirmative sentence.
(If you mean the past, this is wrong in an affirmative sentence.) -
✓ I used to go there every day.
(I used to go there every day.)
But:
(But:)
- ✓ I didn’t use to go there every day.
(I didn’t use to go there every day.) - ✓ Did you use to go there every day?
(Did you use to go there every day?)
At VerbPal, we build these contrasts into drills so you practise the exact form under pressure: affirmative, negative, and question forms mixed together.
(At VerbPal, we build these contrasts into drills so you practise the exact form under pressure: affirmative, negative, and question forms mixed together.)
That matters because real fluency means producing the right pattern quickly, not just recognising it on a page.
(That matters because real fluency means producing the right pattern quickly, not just recognising it on a page.)
Pro Tip: Watch for the three lookalikes: used to do, be used to doing, and get used to doing. They are different grammar patterns. Write one example of each.
(Pro Tip: Watch for the three lookalikes: used to do, be used to doing, and get used to doing. They are different grammar patterns. Write one example of each.)
If you keep mixing up used to, would, and be used to, you need more than explanation — you need repetition at the right time.
(If you keep mixing up used to, would, and be used to, you need more than explanation — you need repetition at the right time.)
In our app, we use spaced repetition with the SM-2 algorithm to bring back exactly the verb patterns you’re about to forget, so the distinction becomes automatic when you speak. We focus on active recall, because tapping the right answer is easier than producing it yourself.
(In our app, we use spaced repetition with the SM-2 algorithm to bring back exactly the verb patterns you’re about to forget, so the distinction becomes automatic when you speak. We focus on active recall, because tapping the right answer is easier than producing it yourself.)
You can start with our 7-day free trial on iOS or Android and practise this exact contrast until it feels automatic.
(You can start with our 7-day free trial on iOS or Android and practise this exact contrast until it feels automatic.)
A simple comparison table you can actually remember
Use this mini-guide when you hesitate.
(Use this mini-guide when you hesitate.)
| Pattern | Use | Example |
|---|---|---|
| used to + base verb | Past habits and past states | I used to live in Seville. |
| would + base verb | Repeated past actions only | Every summer, we would swim in the lake. |
| didn’t use to + base verb | Negative past habits and states | I didn’t use to enjoy public speaking. |
| Did + subject + use to + base verb? | Questions about past habits and states | Did you use to work here? |
Quick contrast set
- ✓ I used to play chess after dinner.
(I used to play chess after dinner.) - ✓ I would play chess after dinner.
(I would play chess after dinner.)
Both are possible because this is a repeated action.
(Both are possible because this is a repeated action.)
- ✓ I used to be terrible at chess.
(I used to be terrible at chess.) - ✗ I would be terrible at chess.
(I would be terrible at chess.)
Only used to works because this is a state.
(Only used to works because this is a state.)
- ✓ I didn’t use to play chess.
(I didn’t use to play chess.) - ✓ Did you use to play chess?
(Did you use to play chess?)
These are the standard negative and question forms.
(These are the standard negative and question forms.)
If you want more support with similar contrasts, see our guide to stative vs. dynamic verbs in English, our breakdown of the English Present Perfect, and our overview of be used to vs. get used to.
(If you want more support with similar contrasts, see our guide to stative vs. dynamic verbs in English, our breakdown of the English Present Perfect, and our overview of be used to vs. get used to.)
You can also browse full English conjugation tables when you need a quick reference.
(You can also browse full English conjugation tables when you need a quick reference.)
Pro Tip: Memorise one pair, not twenty rules: used to be, but would do. Then test yourself with two new verbs: one stative and one dynamic.
(Pro Tip: Memorise one pair, not twenty rules: used to be, but would do. Then test yourself with two new verbs: one stative and one dynamic.)
How to sound more natural when speaking
Many learners ask: if both are possible for repeated actions, which one should I choose?
(Many learners ask: if both are possible for repeated actions, which one should I choose?)
The answer is practical:
(The answer is practical:)
- Use used to when you want the safest, most flexible option.
(Use used to when you want the safest, most flexible option.) - Use would when you are telling a story or describing a routine in a more narrative way.
(Use would when you are telling a story or describing a routine in a more narrative way.)
Compare:
(Compare:)
-
I used to walk to school.
(I used to walk to school.)
Neutral, clear, everyday.
(Neutral, clear, everyday.) -
When I was a child, I would walk to school with my brother.
(When I was a child, I would walk to school with my brother.)
More descriptive and story-like.
(More descriptive and story-like.)
For most conversations, used to is enough.
(For most conversations, used to is enough.)
It works with actions and states, so it is the more reliable tool.
(It works with actions and states, so it is the more reliable tool.)
That said, understanding would helps you sound more natural when listening to native speakers, especially in memories and anecdotes:
(That said, understanding would helps you sound more natural when listening to native speakers, especially in memories and anecdotes:)
- My dad would always sing in the car.
(My dad would always sing in the car.) - We would sit on the balcony and talk for hours.
(We would sit on the balcony and talk for hours.)
These are common, natural patterns.
(These are common, natural patterns.)
At VerbPal, we focus on exactly this kind of production.
(At VerbPal, we focus on exactly this kind of production.)
It’s not enough to think, “I know the rule.”
(It’s not enough to think, “I know the rule.”)
You need to retrieve the form fast enough to use it in a meeting, an exam, or a real conversation.
(You need to retrieve the form fast enough to use it in a meeting, an exam, or a real conversation.)
That’s why our drills keep bringing back high-frequency patterns like used to, would, and didn’t use to until they become available on demand.
(That’s why our drills keep bringing back high-frequency patterns like used to, would, and didn’t use to until they become available on demand.)
And yes, Lexi the dog 🐶 may appear inside a session to remind you of the pattern family when your brain starts overcomplicating things: stative verbs, phrasal clusters, and modal stacks all get easier when you recognise the logic behind them.
(And yes, Lexi the dog 🐶 may appear inside a session to remind you of the pattern family when your brain starts overcomplicating things: stative verbs, phrasal clusters, and modal stacks all get easier when you recognise the logic behind them.)
Pro Tip: If you are speaking live and you hesitate, choose used to. It is more versatile and less risky. Practise one story twice: first with used to, then with would only where repeated actions fit.
(Pro Tip: If you are speaking live and you hesitate, choose used to. It is more versatile and less risky. Practise one story twice: first with used to, then with would only where repeated actions fit.)
If this explanation makes sense on the page but still disappears when you speak, that gap is exactly what VerbPal is built for.
(If this explanation makes sense on the page but still disappears when you speak, that gap is exactly what VerbPal is built for.)
You don’t just read the rule — you practise choosing the right form until used to and would feel automatic in real conversations.
(You don’t just read the rule — you practise choosing the right form until used to and would feel automatic in real conversations.)
FAQ: Used to vs. would
Can I always replace used to with would?
No.
(No.)
You can replace used to with would only for repeated past actions.
(You can replace used to with would only for repeated past actions.)
- ✓ I used to go there every Friday.
(I used to go there every Friday.) - ✓ I would go there every Friday.
(I would go there every Friday.)
But not for states:
(But not for states:)
- ✓ I used to be tired after work.
(I used to be tired after work.) - ✗ I would be tired after work.
(I would be tired after work.)
Is didn’t use to correct?
Yes.
(Yes.)
This is the standard modern form.
(This is the standard modern form.)
- ✓ I didn’t use to like tea.
(I didn’t use to like tea.)
After did, use the base form use.
(After did, use the base form use.)
Why is I would live in Rome wrong?
Because live here describes a past state or situation, not a repeated action.
(Because live here describes a past state or situation, not a repeated action.)
Say:
(Say:)
- ✓ I used to live in Rome.
(I used to live in Rome.)
Do native speakers use would for past habits often?
Yes, especially in stories and memories:
(Yes, especially in stories and memories:)
- In winter, we would sit by the fire and read.
(In winter, we would sit by the fire and read.)
But in everyday speech, used to is often simpler and more flexible.
(But in everyday speech, used to is often simpler and more flexible.)
What’s the difference between used to and be used to?
They are different structures:
(They are different structures:)
-
used to + verb = past habit/state
(used to + verb = past habit/state)- I used to work late.
(I used to work late.)
- I used to work late.
-
be used to + noun/-ing = accustomed to
(be used to + noun/-ing = accustomed to)- I am used to working late.
(I am used to working late.)
- I am used to working late.
At VerbPal, this is exactly the kind of contrast we revisit with spaced repetition, so the right form comes back before you forget it.
(At VerbPal, this is exactly the kind of contrast we revisit with spaced repetition, so the right form comes back before you forget it.)
Pro Tip: Use the FAQ as a self-test. Cover the answers and explain each rule out loud in your own words before checking.
(Pro Tip: Use the FAQ as a self-test. Cover the answers and explain each rule out loud in your own words before checking.)
(Practise used to vs. would until the choice feels automatic)
(Start your 7-day free trial at verbpal.com. VerbPal is available on iOS and Android, with active drills and SM-2 spaced repetition built for adult ESL learners.)