Ответ:

1. Were dancing (dance) arrived (arrive)

2. Were watching (watch) started (start)

3 Leaves (leave) got (get) drove (drive)

4 Arrived (arrive) was watching (watch)

5 Saw (see) was walking (walk)

6 Painted (paint)

7 Were you doing (you/do)

8 Was cooking (cook) was wasfing (wash)