3.they/ return home/yesterday //No

.Did they return home yesterday?

No, they didn't .

4. Mrs.Robinson/buy a poster //Yes

Did Mrs.Robinson buy a poster?
Yes,he did

5. you/send me those flowers //yes

.Did you send me those flowers?
Yes, I did.

6. She/ receive many gifts // No

....Did she receive many gifts?
...No , she didn't......

7. we / meet her at the meeting / last week// yes

.Did we meet her a the meeting last week ?
Yes, we did.....

8. they/ live in this town/in 1990// No

..Did they live in this town in 1990?
No, they didn't....