1) They will buy a computer
Will they buy a computer?
Yes, they will .
2. He will close the door
Will he close the door?
Yes, he will.
3. She will do her homework
Will she do her homework?
Yes, she will.
4. We shall give her the cup
Shall we give her the cup?
Yes, we shall.
5. They will take their toys
Will they take their toys?
Yes, they will.
6. They will not buy a bike
Will they buy a bike?
No, they won't
7. He will not cook porridge
Will he cook porridge?
No, he won't
8. She will not watch TV
Will she watch TV?
No, she won't
9. The pupils will not read the text
Will the pupils read the text?
No, they won't
10. Her parents will not work next Saturday.
Will her parents work next Saturday?
No, they won't
11. They would like to watch birds
Would they like to watch birds?
Yes, they would
12. She likes to draw birds.
Does she like to draw dirds?
Yes, she does
13. The boys like to read Russian books.
Do the boys like to read Russian books?
Yes, they do
14. Bob can go to the Zoo.
Can Bob go to the Zoo?
Yes, he can
15. Bob is at the Zoo.
Is Bob at the Zoo?
Yes, he is
16. They go to the Zoo.
Do they go to the Zoo?
Yes, they do
17. He goes to the park.
Does he go to the park?
Yes, he does
18. Ann will meet her teacher tomorrow.
Will Ann meet her teacher tomorrow?
Yes, she will
19. The pupils can take their cassettes.
Can the pupils take their cassettes?
Yes, they can
20. The pupil must buy two books.
Must the pupils buy two books?
Yes, they must
По-моему как-то так :)