Ответ:

1) I was doing my homework yesterday at 4 PM.

2) We were having a great time at the beach!

3) You was watching TV while I was doing the laundry.

4) My dog was playing with me a few minutes ago.

5) You were doing great last month.

6) Jessica was cleaning the dishes.

7) You were playing with my cat.

8) They weren't playing video games.

9) She wasn't joking.

10) The professor was helping me.