Ответ:

1) I used to live in a flat when I was a child.

2) Did we use to go to the beach every summer?

3) She used to love eating chocolate, but now she hates it.

4) He did not use to smoke.

5) I used to play tennis when I was at school.

7) Did he use to play golf every weekend?

Ответ:

1. I used to live in a flat when I was a child. (+)

Did I use to live in a flat when I was a child? (?)

I didn't use to live in a flat when I was a child. (×)

2. We used to go to the beach every summer. (+)

Did we use to go to the beach every summer? (?)

We didn't use to go to the beach every summer. (×)

3. She used to love eating chocolate, but now she hates it. (+)

Did she use to love eating chocolate? (?)

She didn't use to eating chocolate. (×)

4. He used to smoke. (+)

Did he use to smoke? (?)

He didn't use to smoke. (×)

5. I used to play tennis when I was at school. (+)

Did I use to play tennis when I was at school? (?)

I didn't use to play tennis when I was at school. (×)

7. He used to play golf every weekend. (+)

Did he use to play golf every weekend? (?)

He didn't use to play golf every weekend. (×)