\(=\dfrac{-40}{56}-\dfrac{21}{56}+\dfrac{2}{56}=\dfrac{-59}{56}\)

1. This last time she came back to her hometown was 4 years ago.

=> She hasn't come back  to her hometown  for 4 years.

2. He started working as a bank clerk 3 months ago.

=> He has worked as a bank clerk for 3 months .

3. It has been 5 years since we first flew to Singapore.

=> We have flown to Singapore for 5 years.

4. I last had my hair cut in November.

=> I haven't had my hair cut in November.

5. The last time we called each other was 5 months ago.

=> We haven't called each other for 5 months.

6. It is a long time since we last met.

=> We haven't met for a long time.

7. When did you have it?

=> How long have your had it?

8. This is the first time I had such a delicious meal.

=> I have never had such a delicious meal before.

9. I haven't seen him for 8 days.

=> The last time I last saw him was 8 days ago.

10. To day is Saturday. I haven't taken a bath since Wednesday.

=> It is Saturday since I have taken a bath.

11. This is the first time he went abroad.

=> He hasn't gone aboard

12. She started driving 1 month ago.

=> She has drived for 1 month.

13. We began eating when it started to rain.

=> We have eaten since it started to rain.

14. I last had my hair cut when I left her.

=> I haven't had my hair cut since I left her

17. It is a long time since we last met.

=> We haven't met for a long time.

16. She started to live in Hanoi 2 years ago. (for)

=>  She has lived in Hanoi for 2 years.

17. He began to study  English when he was young. (since)

=>   He has studied English since he was young.

18. I have never eaten this kind of food before. (This is)

=>   This is the first time I have ever eaten this kind of food.

19. I have never seen such a beautiful girl before. (She is)

=>   She is a beautiful girl I have seen.

20. This is the best novel I have ever read. (before)

=>  I have never read the good novel before.

1.Giảm lực ma sát khiến vật quay trơn tru hơn

2.Liếm tiền thì sẽ dễ đếm hơn vì nước bọt khiến tay bám zô tiền dễ đếm hơn dù hơi mất vệ sinh nhưng ko đến nỗi chết người

    Em khuyên bạn đưa cho đứa khác đếm tiền để đỡ bẩn mồm

Động từ:sai bắt,giao,xét xử

1.my/your

2.my

3.I/my

4.her

5.Nam and Lan's teacher

6.is /Her

7.Those student’s school bags

8.your/He

9.are you/She

10.The women's bike/the men's bike

1.Với bản thân: Em thấy mình cần phải tích cực học tập để không phụ lòng ba mẹ

   Với bố mẹ: Con yêu ba mẹ nhiều lắm con sẽ học hành thật giỏi để mang bông hoa điểm 10 về cho bố mẹ

2.Biểu hiện:lễ phép, chăm học,chăm chỉ,hiếu thảo

52.became

53.play

54.goes/doesn't like

55.has worked

56.Are you watching

57.is designing

1.B

2.D

3.A

4.A

5.A

47.go

48.stop/buy

49.have studied

50.don't see/doesn't visit

51.met

41.is reading

42.always writes

43.has been

44.did you put

45.wait/wait

46.Do you take