English gives you three structures that look alike and get mixed up constantly. I used to smoke, every summer we would go to the sea, and I am used to the cold do three different jobs. Two describe the past; one describes how you feel now. This guide keeps them apart, shows you the spelling traps, and explains the one rule that stops half the mistakes: would cannot describe a state.

Used to for past habits and past states

Used to + base verb is the workhorse. It describes something that was true or happened repeatedly in the past but is not true now. The contrast with the present is the whole point of it.

It covers two things. First, past habits, repeated actions you no longer do:

• I used to smoke, but I gave up two years ago.
• We used to walk to school every day.

Second, past states, situations that were true for a while and have since changed:

• She used to live in Spain.
• I used to have long hair.
• He used to be really shy.

Notice that live, have and be are not actions you repeat; they are situations. Used to handles both the actions and the situations without any fuss, which is why it is the safe choice when you are not sure.

Positive, negative and question forms

This is where the spelling catches people out. In a positive sentence, it is used to with a d at the end:

I used to play the guitar.

For negatives and questions, you bring in did, and did already carries the past tense. So the d drops off and it becomes use to:

I didn't use to like coffee. (not didn't used to) Did you use to live abroad? (not Did you used to)

The two spellings sound identical when you say them, so the ear does not help you. The rule is simple: after did, drop the d. Everywhere else, keep it.

Would for repeated past actions

Would + base verb is a second way to talk about past habits. It often sounds a little more nostalgic, the kind of thing you find when someone remembers their childhood.

• Every summer we would go to the sea.
• My grandad would sit in that chair for hours.
• When it rained, we would play cards in the kitchen.

In all of these you could swap in used to and the meaning barely changes: every summer we used to go to the sea is just as good. So for repeated actions, the two are interchangeable.

The key limit: would does not work with states

Here is the rule that matters most. Would only works for actions you repeated. It does not work for states, situations that simply existed.

You can say I used to live in Spain, but you cannot say I would live in Spain when you mean it as a past situation. Live is a state, not a repeated action, so would refuses to do the job. The same goes for have, be, know, like and other state verbs.

The takeaway: used to always works for the past; would only works when the verb is an action you did again and again. When in doubt, use used to.

Be used to: a completely different structure

Now the one that looks the same but means something totally different. Be used to means to be accustomed to something, to find it normal because you have experienced it a lot. It is not about the past at all; it describes how something feels to you now.

The structure is be used to + noun or be used to + -ing:

• I am used to the cold. (the cold feels normal to me)
• She is used to getting up early. (early mornings are normal for her)
• We are not used to the noise yet.

There is a related version, get used to, for the process of becoming accustomed:

• It took me a month to get used to the traffic.
• You will get used to it.

The huge trap is confusing used to do with be used to doing:

• I used to work nights. = A past habit. I did it before; I do not now.
• I am used to working nights. = Night work feels normal to me. I might still do it.

The first is a finished past routine. The second is a present feeling. The little words am, is, are (or get) in front are the signal that you have switched structures. And after be used to, you use a noun or an -ing form, never a base verb: I am used to the cold or I am used to waking up early, not I am used to wake up early.

No used to for the present

Used to is only ever about the past. For a present habit, do not reach for it. Use the present simple with a frequency word like always, usually or often:

• I usually get up at seven. (not I use to get up at seven)
• She always drinks tea in the morning.

If you want to say a present routine feels normal, that is the other structure, be used to: I am used to getting up at seven. But a plain present habit is just the present simple.

Summary table

Common mistakes

Ranked by how often learners actually make them.

1. use to instead of used to in positives. In a plain positive sentence it is used to with a d: I used to play football, not I use to play football. The d only disappears after did.
2. Keeping the d after did. The opposite slip. Did you used to smoke? and I didn't used to smoke are wrong. Did already marks the past, so it is Did you use to smoke? and I didn't use to smoke.
3. would for a state. I would live in Spain or She would have a dog are wrong when you mean a past situation. Would only works for repeated actions; for states you need used to: I used to live in Spain, she used to have a dog.
4. be used to + base verb. After be used to you need a noun or an -ing form. I am used to get up early should be I am used to getting up early.
5. Mixing up used to do and be used to doing. I used to work here (a finished past job) is not the same as I am used to working here (the job feels normal). Check whether there is an am/is/are/get in front before you choose your meaning.
6. used to for the present. I use to go to the gym on Mondays meaning a current routine is wrong. Use the present simple: I usually go to the gym on Mondays.

Practice

Choose the best option to complete each sentence. Answers are below.

1. When I was a child, I ___ (used to / am used to) be afraid of the dark.
2. ___ (Did you use to / Did you used to) play a sport at school?
3. Every winter my family ___ (would / used to) go skiing in the mountains.
4. I have lived here for years, so I ___ (used to / am used to) the noise now.
5. She ___ (would / used to) have three cats. (Careful: state.)

Answers: 1. used to (past state) 2. Did you use to (drop the d after did) 3. would or used to (a repeated action, both fine) 4. am used to (accustomed now, followed by a noun) 5. used to (have is a state, so would does not work).