Exercise :Find ONE mistake in each of the following sentences:

1. (A)Last year, my son (B)was lost (C)among the crowd when we (D)have gone shopping.

2. The problem (A)has turned out (B)to be more serious (C)than we (D)will have thought.

3. (A)Almost 300 million people (B)had visited (C)America’s national parks (D)every year.

4. They (A)have studied English(A) before they went (C)to London.

5. They (A)has got married (B)for 30 years (C)by the end of (D)this month.

6. They (A)will help you (B)whenever you (C)will ask (D)them.

7. (A)When Sam (B)will arrive, he will (C)open (D)the gift.

8. My father (A)has ever told (B)me honestychân thât (C)was (D)the best policy.

9. Did you say (A)that you (B)will have a lot of things (C)to do the (D)following week?

10. (A)When we arrived (B)at (C)the station, the train (D)has already left.

11. (A)Did your doctor (B)recommend you that you (C)will stop (D)smoking?

12. (A) Up to now, there (B)had been (C)no woman (D)being chosen the US president.

13. The neighbors (A)are having a party. They (B)are making so much noise (C)since 6 o’clock. I (D)can’t sleep.

14. (A)Don’t (B)leave the house (C)until I (D)will get back.15. I (A)was walking along the pavement(B) when I (C)realized that there (D)has been a man following me.

16. Human (A)had struggled (B)against weeds (C)since the beginning (D)of agriculture.

17. Mary (A)said (B)that she (C)do jogging (D)every morning.

18. (A)At this time (B)next week, Peter (C)was working (D)in London.

19. Never I (A)have seen (B)such a (C)good film (D)before.

20. (A)Before the 1920s, (B)no women (C)will vote (D)in the US.

21. Some students have always (A)complain that they (B)do not have (C)enough money (D)to spend.

22. The teacher (A)got (B)angry with him (C)because he sometimes (D)come to class late.

23. (A)Up to now, there (B)had been (C)no woman (D)being chosen the US president.

24. The mother (A)had always took (B)good care (C)of her (D)little son.

25. An American woman (A)not always (B)shake hands (C)when she is introduced (D)to a man.

26. Peter (A)has been written the composition (B)for 3 hours and he (C)has not finished (D)yet.

27. We (A)were a few minute late (B)so the film (C)was already started when we (D)got to the cinema.

28. (A)By the time (B)the police (C)come, the robber (D)had run away.

29. Why (A)didn’t Peter (B)go to school? What (C)did happened (D)to him?

30. I (A)was listening (B)to the radio (C)when the door bell (D)will ring.

31. Why (A)are you so late? I (B)am waiting here (C)for you for more (D)than one hour .

32. Phuc never (A)go to bed (B)before he (C)has finished his (D)homework.

33. I (A)have learnt English (B)for I (C)was ten (D)years old.

34. Yesterday evening (A)while I (B)was watching TV, Mai (C)pays me (D)a visit.

35. We (A)went out (B)for a walk (C)after we (D)had our dinner.

36. (A)As soon as (B)the next lecture (C)will end, (D)let’s leave.

37. Mr. Ba (A)had a daughter who (B)were born in 1950, but (C)who died a few years (D)later.

38. (A)After they (B)were playing cards, (C)someone broke (D)into the house.

39. A (A)city university professor reported that he (B)discovers a vaccine(C)which could (D)prevent bird flu.

40. Factories discard waste that (A)had (B)polluted air and water, but factories (C)give us (D)employment.

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