11. He can't park near his office; that's why he doesn't come by car. => If he____ 12. My house is guarded by two big dogs. That's the only reason it isn't broken into every night. => If my house____ 13. The flats are not clearly numbered, so it is yery difficult to find anyone. => If the flats____ 14. I don't know her e-mail address, so I can’t tell you. => If I_____ 15. She works in the evening. She has no time to play with her children => If she_____ 16. I don't want them to be upset, so I've decided not to tell them what happened. => They____ 17. I am not tall enough to join the basketball team. => If I______ 18. He doesn't see the signal so he doesn't stop his car => If he_____ 19. Peter gets bad marks because he doesn't prepare his lessons well => If Peter_____ 20. Mary doesn't have enough money. She can't buy a new car. => If Mary_____ 21. Go right now or you’ll be late for the train. => If you_____ 22. He doesn't apply for the job because he doesn't have enough qualifications. => If he_____ 23. Hurry up, or we will be late for the exam. => If we_____ 24. They do not understand you because you do not often talk to them. => If you____ 25. Because you speak English unnaturally, they do not understand you => If you____

1. She doesn't live in London because she doesn't know anyone there. =>She'd_____ 2. I can't live in the country because I can't find a job there. => I'd_______ 3. I don't have a spare ticket. I can't take you to the concert. => If I_____ 4. The schoolchildren sowed some seeds, but they forgot to water them so they didn't grow. => If the children____ 5. They don't understand the problem. They won't find a solution. => If they_____ 6. He sits around too much. He isn't fit. => If he_____ 7. Carol didn't answer the phone because she was studying. => If Carol____ 8. Rita is exhausted today because she didn't get any sleep last night. => If Rita_____ 9. She's very thin; perhaps that's why she feels cold so much. => If she____ 10. He never polishes his shoes, so he never looks smart. => If he_____

SỬA LỖI SAI. GIẢI THÍCH GIÚP MÌNH NHÉ. 1. After Mrs. Wang had RETURNED TO HER HOUSE from work, she___COOKING didnner. 2. Jimmy THREW the ball HIGH in the air, and Betty CATCHING it WHEN it. 3. Linda has WORN her NEW YELLOW dress ONLY ONCE since she BUYRY it 4. Last week Mark TOLD, me that he GOT very bored with his present job and IS LOOKING for a new one. 5. HAVING FED the dog, he WAS SAT down TO his OWN meal. 6. When I turned on my computer, I was SHOCKED TO FIND some junK, mail, and I JUST DELETE it all. 7. They are going TO HAVE TO LEAVE SOON and SO DO we. 8. The boss laughed when secretary HAS TOLD kim that she REALLY NEEDED a PAY rise 9. The telephone rang several TIMES and THEN STOP before I COULD answer it. 10. Debbie, WHOSE FATHER is an excellent tennis PLAYER, HAS BEEN playing.

GÌ RA I THÍCH GIÙM MỚI MÌNH NHỚ. 21. It (rain)____ hard. We can't do anything until it (stop)_____. 22. Last night we (watch)_____ TV when the power (fail)____. 23. That evening we (stay)_____ up to talk about he town where he (live)_____ for some years. 24. I (sit)_____ down for a rest while the shoes (repair)_____. 25. Half way to the office Paul (turn)____ round and (go)____ back home because he (forget) to turn the gas off. 26. London (change) a lot since we first (come)____ to live here. 27. While we (talk)____on the phone the children (start)____ fighting and (break)____ a window. 28. He used to talk to us for hours about all the interesting things he (do)____ in his life. 29. You know she (stand)____ looking at that picture for the last twenty minutes. 30. I (spend)____ a lot of ine travelling since I (get)____ this new job. 31. When I (be)_____ at schoo we all (study)____ Latin. 32. When I (meet)____ him he (work)_____ as a waiter for a year or So. 33. After he (finish)______breakast he (sit)______ down to writesome letters 34. She (have)____ a hard life, but she's always smiling. 35. I think Jim (be)_____ out of town

GIẢI THÍCH GIÚP MÌNH VỚI NHÉ. 11. The traffic was very heavy. By the time I (get)_____ to Mary's party, everyone already (arrive)_____ 12. I will graduate in June. I (see) you in July. By the time I (see)____ you , I(graduate)_____. 13. I (visit)_____ my uncle's home many times when I (be)____ a child. 14. That book (lie)____ on the table for week. You (not read)__ it yet? 15. David (wash)____ his hands. He just (repair)____ the TV set. 16. You (be)____ here before? Yes, I (spend)____ my holidays here last year. 17. We never (meet)___ him. We don't know what he (look)____like. 18. The car (be)____ ready for him by the time he (come)_____ tomorrow. 19. On arriving at home I (find)____ that she just (leave)____ a few minutes before. 20. When we (arrive)____ in London tonigbt, it probably (rain)____.

GIẢI THÍCH GIÚP MÌNH VỚI NHÉ. 1. In all the world, there (be)______ only 14 mountains that (reach)_____ above 8,000 meters. 2. He sometimes (come)____ to see his parents. 3. When I (come)_____, she (leave)_____ for Dalat ten minutes ago. 4. My grandfather never (fly)_____ in an airplane, and he has no intention of ever doing so. 5. We just (decide)____ that we (undertake) the job. 6. He told me that he (take)_____ a trip to California the following week. 7. I knew that this road (be)_____ too narrow. 8. Right now I (attend)_____ class. Yesterday at this time I (attend)___ class. 9. Tomorrow I'm going to leave for home. When I (arrive)_____ at the airport, Mary (wait) for me. 10. Margaret was born in 1950. By the year 2005, she (live)_____ on this earth for 55 year.