1. I (to walk) slowly down the street when somebody (to call) me. 2. The woman (to put) some perfume into her bag when the shop-girl (to see) her. 3. The woman (not to see) that the girl (to look) at her. 4. We (not to stop) to look at a shop window. 5. She (to try) on a sweater while I (to talk) to the manager. 6. You still (to work) when I left? 7. I (to break) a plate last night. I (to do) the washing up when it (to slip) out of my hand. 8. Fred (not to drive) very fast when the accident (to happen). 9. Though it (to be) late somebody (to play) the piano. 10. I (to watch) a very interesting detective film when he (to call).

1) was walking / called; 2) was putting / saw; 3) didn't see / was looking; 4) didn't stop; 5) was trying / was talking; 6) were you still working; 7) broke / was doing / slipped; 8) wasn't driving / happened; 9) was / was playing; 10) was watching / called.