1. Wood usually (float) ....floats.... on the water.
2. Look out ! The ceiling (fall) .....is falling.... in.
3. At school, we (learn) ...learn.... two foreign languages.
4. As a boy, I (always read) ....always read.... I always (have) .....have...... my nose in a book.
5. By the time I (recover) .....recover..... from the shock he (disappear) .....disapear..... round the corner.
6. I am going to write John as soon as I (have) .... have.... spare moment.
7. The thief was arrested as he (leave) ......leaved..... the bank.
8. We (send) .....send.... the money as soon as the gooods are delivered.
9. Before we (go) .....go.... very far we found that we (lose) .....lose..... our way.
10. By the end of this year I (be) ...was...... here for fifteen years.
11. After I (hear) ....heared.... the news yesterday evening I (hurry) .....hurry.... to see him.
12. I (not give) ......am not give.... another cake till you (finish) .....finish.... your milk.
13. I'm busy at the moment. I (decorate) .....an decorating.... the living room.
14. This is the house that Jack (buid) ...built..... three years ago.
15. Mary (have) ......had..... dinner when her friend called.
16. John (live) .....been lived.... in the same house since he left school.
17. Shut all the windows before you (go) ....go.... out.
18. Up to now, the teacher (give) .....is giving..... our class 5 tests.