36. He hasn't played his water-pistol __________ 1990.

35. We haven't seen each other __________ five years.

34.If he _______ (not want) to do something，nobody can make him _______ (do) it.

33.How many English words _______ you _______ (learn)?

32.His mother _______ just _______ (come) back from work and she _______ (cook) at the moment.

31.“How long _______ he _______ (be) here?” “Since 1994.”

30.What _______ you _______ (do) when the boy _______ (break) the window?

29.If it _______ (rain) the day after tomorrow，we _______ (not go) picnicking.

28.The Turners _______ (move) to Shanghai in 1990.

27.Mr. Green _______ (teach) in our school since he _______ (come) to China.