Ответ:

2. did you finish

   I did

3. did you visit

   I didn`t

4. did you help

   I did

======2======

-  Did you finish your homework?

- Yes, i did

======3======

- Did you visit your grandparents at the weekend?

- No, i didn't

======4======

- Did you help with shopping?

- Yes, i did

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