Ответ:

1. eat

2. ate

3. are eating

4. did eat

5. will you

6. is eating will eat

7. Have eaten

8.eats

9.have eaten

10. did eat

11. eat

12.had eaten

13.eats

14.eat

15.eats

16.has eaten

17.have eaten

18. had eaten

19.have eaten

20.have eaten