36. My father (not smoke) for 5 years.

37. My teacher wasn’t at home when I (arrive). He (just go) out.

38. How long Bob and Mary (be) married?

39. You (receive) any letter from your parents yet?

40. My brother (join) the army when he (be) young.

41. You (remember) my name or you (forget) it someday?

42. Tom (study) chemistry for three years and then he gave it up.

43. Miss Lee often (write) when she was on holiday.

44. He (leave) home two weeks ago and we (not hear) from him since then.

45. You (speak) to Mrs Baker yesterday?

No, I (not see) her for a long time.

I (not can) remember when I last (see) her.

46. When the teacher came in, the pupils (play) games.

47. Columbus (discover) America more than 400 years ago.

48. By next month, I (finish) my first novel.

49. By May 5, we (live) in this city for ten years.

50. When your father (die)?