mọi người ai giúp e giải mấy câu này với ạ e đang cần gấp giair thích giúp em nữa nhé e cảm ơn trước ạ 31.Our teacher (tell) us yesterday that he (visit) England in 1970. 32.George (work) at the university so far. 33.When he lived in Manchester, he (work) in a bank. 34.Birds (build) their nests in summer and (fly) to the South in winter. 35.1 (lose) my key. (can) you help me look for it? 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)? I (not know) when he (die).