Each sentence below contains a mistake.Write the mistake and correct it

1. I have studied English since a quarter of a decade.

2. Tom and Nam played chess with each other at this time last month.

3.  She has started waiting for Mo for a long time.

4. Maria and her husband have lived here when they were 46.

5. What have many disigners do to modernize the Ao dai?                                                  giúp vs mn 

   My brother stopped working in this factory last month

→ My brother hasn’t .......................

AIDS desease (kill) a lot of people recently

41. I (practise) speaking English while my brother (listen) to music 

42. We (have) cakes while they (eat) sweets

 43. She (wait) for Tom while Tom (sleep) well 

44. He (watch) T.V while they (sing) 

45. What you (do) while they (fight) your brother? 

46. What she (do) while you (be) at school? 

47. What they (do) while he (cut) the flowers?

48. While her husband (cook) , what she (do)? 

49. While your teacher (explain) the lesson ,what you (do)? 

50. What you (do) between seven and eight last night? - We (have) dinner.

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