it didn't
he did
it was
they weren't
it didn't
it wasn't
I did
they were
they weren't
it wasn't
she did
he was
it didn't
I didn't
I wasn't
they were
he did
it wasn't
3. it didn't
4.he did
5.it was
6. they weren't
7.the dog didn't
8.the coffee wasn't
9.they were
10.they were
11.the exam weren't
12. the movie wasn't
13.she did
14. my classmate ứa
15. the train didn't
16. I didn't
17. I weren't
18. the children were
19. he did
20. the book wasn't