1/ were building

2/ was driving

3/ was chatting-was teaching

4/ was watching

5/ was preparing

6/ were you doing

7/ were you going

8/ weren't going

9/ wasn't doing

10/ was reading-was playing

Exercise 1: Complete the sentences, using the past continuous of the suitable verbs in the box above
1. At this time last year, they (build) were building this house.
2. I (drive) was driving my car very fast when you called me.
3. I (chat) was chatting with my friends while my teacher (teach) was teaching the lesson yesterday.
4. My father (watch) was watching TV when I got home.
5. At this time yesterday, I (prepare) was preparing for my son’s birthday party.

6. What you (do) was you doing at 8 pm yesterday?

7. Where you (go) was you going when I saw you last weekend?

8. They (not go) weren't going to school when I met them yesterday.
9. My mother (not do) wasn't doing the housework when my father came home.
10. My sister (read) was reading books while my brother (play) was playing football yesterday afternoon.