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Past simple negatives and questions
We use did and didn’t to make negatives, questions and short answers in past simple.

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Word order in questions
Remember that the word order in questions is QWASI: (Question Word), Auxiliary (did), Subject, Infinitive.

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Infinitive without to
We use did or didn’t with the bare infinitive of the main verb (= infinitive without to).
- I didn’t work yesterday.

- I didn’t didn’t worked yesterday.

- Did you go to the concert?

- Did you went to the concert?

Don’t use did in positive sentences
We use did or didn’t in negatives, questions and short answers, but NOT in positive sentences.
- We stayed home yesterday.

- We did stay home yesterday.

- I went out last night.

- I did go out last night.

Did or was/were?
We use did and didn’t (NOT was/wasn’t or were/weren’t) as the auxiliary verb in negatives and questions in past simple.
- We didn’t eat at 6.

- We weren’t eat at 6.

- Did you do your homework?

- Were you do your homework?

We do NOT use did or didn’t in past simple negatives or questions when the main verb is be.
- They weren’t happy.

- They didn’t be happy.

- Was he at home?

- Did he be at home?

- I didn’t work yesterday.
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