Past Simple: Negatives and Questions (did/didn't)

Past Simple: Negatives and Questions (did/didn't)

We use the helper verb did for negatives and questions about the past. It is the same for all subjects: I, you, he, she, it, we, they. Did shows the past, so the main verb stays in the base form. The base form is the basic verb: go, not went; watch, not watched.

Structure

• Negative: Subject + did not (didn't) + base form. Example: They didn't watch the film.
• Yes/no question: Did + subject + base form? Example: Did they watch the film?
• Question with a question word: Question word + did + subject + base form? Example: Where did they go?

How the Grammar Works

1. Use did for every subject. There is no special form for he, she or it. Example: He didn't call.
2. The main verb is in the base form. Example: She went home becomes She didn't go home, not She didn't went home.
3. In questions, put did before the subject. Example: Did you see that?
4. In short answers, use only the helper. Example: Did you call him? - Yes, I did. / No, I didn't.

Common Use Cases

• Saying what did not happen: We didn't go out yesterday.
• Asking about the past: Did you sleep well?
• Asking for details: When did they arrive?
• Giving short answers: Yes, she did. / No, she didn't.

Question Words with did

Put a question word before did: where, what, when, why, how, who.

• Where did you go? - I went to the market.
• What did she buy? - She bought some bread.
• Why didn't he call? - He forgot his phone.
• Who did you call? - I called my sister.

Be careful: who or what can be the subject. Then we do not use did. Examples: Who called you? What happened?

Frequent Mistakes and How to Avoid Them

• Past form after did. Incorrect: Did you went there? Correct: Did you go there? Did already shows the past.
• Past form after didn't. Incorrect: He didn't came. Correct: He didn't come.
• Past form after a question word + did. Incorrect: Where did you went? Correct: Where did you go?
• No helper in a standard question. Use Did you see him? People sometimes say You saw him? to check or show surprise. Learn Did you see him? first.
• Did with who as the subject. Say Who called you?, not Who did call you?

Comparison with Related Grammar

In positive sentences, the verb changes: walked, went. We do not say She did walk. Did can also be a main verb: I did my homework.

Do not use did with was and were. Say She wasn't tired, not She didn't be tired. For questions, put was or were first: Were you tired? Was he at home?

Example Sentences

• I didn't eat breakfast today.
• Did you enjoy the party?
• She didn't go to school on Monday.
• What did he buy at the shop?
• Did they play football? - No, they didn't.
• Who called you?
• Were you at home last night?

When to Use This Rule

Use did and didn't to make negatives and questions about finished actions in the past.