Negative
had + not + past participle — no did anywhere.
I had not stretched. → I hadn't stretched.
She had not left. → She hadn't left.
Question
Put had in front of the subject.
| Statement | Question |
|---|---|
| You had finished. | Had you finished? |
| She had left. | Had she left? |
| They had started. | Had they started? |
The past perfect never borrows did. Did you had finished? is
two helping verbs in a fight.
Short answers
Answer with had, not with the main verb.
- Had you finished? — Yes, I had. / No, I hadn't.
- Had she left? — Yes, she had. / No, she hadn't.