1. When I (arrive) ..arrived ..at this house, he was still sleeping(sleep) .

2. The light (go) ..went ...out while we (have) were having dinner.

3. Bill (have) ..was having..breakfast when I (stop) ..stopped ..at this house this morning.

4. She (wash) was washing....up when Vinh (arrive) ..arrived..at this house.

5. As we (cross) .were crossing...the Street, we (see) ...saw ..an accident.

6. Tom (see) ..saw....a serious accident while he (stand)was standing at the bus stop.

7. The children (play) ..were playing...football when their mother (come) ...came ... back home.

8. The bell (ring)rang while Tom (take) was taking a bath.

9. He (sit)was sitting in a car when I (see)saw him.

10. We (clean) were cleaning the house when she (come) came yesterday.