Ответ:

Ex 1

2 were playing

3 were walking

4 were studying

5 was sleeping

Ex 2

2 We weren't having dinner at eight. We were having breakfast.

3 My parents weren't driving home from work last night. They were cooking a meal.

4 I was studying for my exam yesterday. I wasn't writing my blog.

5 Della and Nancy weren't shopping on Saturday. They were visiting their grandparents.

Ex 3

2 Were Any and Adam fighting?- Yes, they were.

3 Was Barbara copying her friend's homework?- No, she wasn't

4 Were Danny and Freddie playing loud music?- No, they weren't.

5 Was Ian doing an exercise?Yes, he was

Ex 4

came

Ex 5