16. (Have you known / Have you been knowing / Did you know) Bill since last year?
17. When you (stayed / stay / will stay) in the country, you’ll enjoy the beauty of the countryside.
18. Nick (has played / has been played / has been playing) football for three hours.
19. Surfing (invented / was invented / was inventing) many years ago.
20. This patient (was cured / will be cured / will cured) by the end of this week.
21. Nuclear weapons (mustn’t use / mustn’t be used / mustn’t be using) by people.
22. Susie (looked / was looking / had looked) through the letters before her elder sister got them.
23. The continent (discovering / discovered) by Cook was called Australia.
24. Do you know the girl (talking / talked) to Tom?
25. (Watering / Watered) by Jane, the flowers looked much fresher.
26. We didn’t expect our relatives (visit / to visit / visited) the Lake District.
27. Did you notice Pauline (to buy / buy / bought) a present for someone?
28. The teacher made the children (clean / to clean / cleaned) the classroom.
29. Bill asked if (did I visit / I had visited / had I visited) a desert in California.
30. Polly told her son (to not stay / not stay / not to stay) up late.
31. Mother told her children (act / to act / acted) their age.
32. Ralph asked (did I notice / if I noticed / if I had noticed) a fat man sitting at the front?
33. Kate said (summers were/ summers are / summers will be) very humid in Moscow.
34. Bill asked (where is / where was / where will be) the best place to go surfing