1. When I ___________ (arrive) the lecture had already started and the professor ____________ (write) something on the board.
2. I ____________ (make) a pudding when the light ___________ (go) out.
3. We suddenly __________ (realize) that we ___________ (travel) in the wrong direction.
4. You ________ (look) very busy when I ___________ (see) you last night. What _______ you __________ (do)?
5. The boys _________ (play) cards when they __________ (hear) their father's step. They immediately __________ (hide) the cards and __________ (take) out their lesson books.
6. As I _________ (walk) in the park I ________ (step) on a banana skin and _________ (fall) heavily.
7. When I _________ (read) a book, I ______ (hear) a knock. I ________ (go) to the door and _________ (open) it, but I _________ (not recognize) my friend at first because I __________ (not wear) my glasses.
8. When I __________ (come) in they ________ (sit) round the fire. Mr. Cooper ____________(do)
a crossword puzzle, Mrs. Cooper _______ ______(knit), the others _______________ (read).
9. Why you __________ (interrupt) me? I __________ (have) a very interesting conversation with Mr. Jackson.
10. When I ___________ (arrive) at the station Jessica __________ (wait) for me.
11. I ________ (be) sorry that I __________ (have to) leave the party early, because I __________ (enjoy) myself.
12. The floor ________ (be) covered with balls of wool. Obviously Grandmother __________ (knit) something.
13. While we __________ (water) the flowers it __________ (begin) to rain.
14. I ___________ (find) this coin as I ____ ________ (dig) in the garden. It looks very old.
15. While I _________ (swim) someone ___________ (steal) my clothes and I _________ (have to) walk to the hotel in my swimsuit.
16. From the sounds it _______ (be) clear that Mary ____________ (practise) the piano.
17. When I first _________ (meet) him he ____________ (work) in a cafe.
S+V(ed)/V2
S+was/were+V-ing