Used to

Used to + base verb describes a past habit or a past state that is no longer true. Every sentence with used to carries a built-in contrast: something was one way before, and now it is different.

This means she lived in Berlin at some point, but she does not live there anymore. If she still lives in Berlin, used to is the wrong choice — Present Simple is what you need.

Form

The structure is the same for all subjects. There is no conjugation — no used to / uses to / using to. The verb after used to is always in the base form.

Notice the spelling: in positive sentences, it is always used to (with -d). In negatives and questions, the -d disappears because did already marks the past tense. This is the same logic as didn't want (not didn't wanted).

Past habits

Use used to for actions that happened regularly in the past but no longer happen.

Each of these describes a routine that existed once and then stopped. The speaker is looking back at a pattern, not a single event.

Past states

Used to also works for situations, facts, and conditions — things that were true for a period of time but are not true anymore.

States are not actions — nobody does anything. The building simply was a hospital; Tom simply was shy. Yet used to fits both habits and states equally well.

Negatives

The negative form is didn't use to (no -d on use).

Negatives with used to are less common in everyday speech. Many speakers prefer a simpler rephrasing: I never liked coffee or She never exercised. Both are correct — the choice is about style, not grammar.

Questions

Questions follow the standard pattern: Did + subject + use to + base verb?

As with negatives, the -d drops from use because did already signals past tense.

Used to vs Past Simple

Both used to and Past Simple can describe the past, but they emphasize different things.

This highlights the habit and implies a change — the speaker no longer smokes.

This is neutral. It reports a fact without saying whether the habit has stopped or not. The speaker might still smoke.

When you want to stress that a past habit or state has ended, used to is the stronger choice. When you simply need to place an event in the past, Past Simple is enough.

One important limit: used to cannot describe a single event. It always implies repetition or duration.

Not: We used to visit Rome last summer. A one-time trip is not a habit or a long-term state.

The spelling trap

The -d at the end of used is easy to forget — or to add where it does not belong. The rule is straightforward:

With did or didn't — write use to (no -d), because did already carries the past tense.

Without did — write used to (with -d).

In speech, the d in used blends into the t in to, so you hear almost no difference. This is why the mistake is so common in writing. When in doubt, check whether did is in the sentence — if yes, drop the -d.

Common mistakes

Spelling in positive sentences

Spelling in negatives and questions

Using "used to" for single events

Mixing up with "be used to"

Using present or future forms