1. Why don't we go for a picnic on the weekend?
=> Let's going for a picnic on the weekend
2. Let's go to work by bus.
=> What about going to work by bus. ?
3. Nga is a good English speaker.
=> Nga speaks English well
4. Unless you get a visa. You can't visit the United States.
=> If you get a visa , you can visit the United States.
5. If you don't succeed, you'll have to try it again.
=> Unless you succeed, you'll have to try it again.
6. I suggest collecting unused cothes.
=> Let's collect unused clothes.
7. Ba is tired. He stayed up late watching TV.
=> Because Ba stayed up late watching TV , he is tired
8. Hoa was careless, so broke the cup.
=> Since Hoa was careless, she broke the cup
9. We were disappointed. She didn't keep her promise. (Adj + that)
=> We were disappointed that she didn't keep her promise
10. It was raining, so we decided to postpone our camping.
=> Since it was raining, we decided to postpone our camping
11. She wants them to sing a song.
=> She suggests they singing a song
12. She couldn't join us beacause she was busy.
=> She was busy, so she couldn't join us
13. Shall we go to the cinema tonight?
=> What about going to the cinema tonight?
14. Why don't we use energy-saving bulbs?
=> I suggest using energy-saving bulbs?
15. Although she was not beatiful, she took part in a beauty contest.
=> She wasn't beatiful but she took part in a beauty contest.
16. Work hard and you'll pass the exam.
=> If you work hard , you'll pass the exam.
17. If you don't start working hard now, you won't be able to pass the final exam.
=> Unless you start working hard now, you won't be able to pass the final exam.
18. We are delighted. You passed your English exam.
=> We are delighted , because you passed your English exam.
19. She was tired and therefore she wanted to go home.
=> She wanted to go home because she was tired
20. Tet is a festival. Tet occurs in late January or early February. (which)
=> Tet is a festival which occurs in late January or early February.
21. The pupil gets the scholarship. He is very poor. (who)
=> The pupil who gets the scholarship is very poor
22. Auld Lang Syne is a song. Auld Lang Syne is sung on New Year's Eve. (which)
=> Auld Lang Syne is a song which Auld Lang Syne is sung on New Year's Eve.
23. Have you ever spoken to the people? They live next door. (who)
=> Have you ever spoken to the people who live next door
24. Is this the book? You want me to read it? (which)
=> Is this the book which you want me to read it? (which)
25. My friend Tom can compose songs. Tom sings Western folk songs very well. (who)
=> My friend Tom, who can compose songs, sings Western folk songs very well.
26. He often tells lies but many people believe him.
=> Although he often tells lies , many people believe him.
27. He is very tired but he has to finish his homework. (even though)
=> Even though he is very tired , he has to finish his homework.
B. Thì hiện tại hoàn thành và thì quá khứ đơn
1. We have learnt Englist for 6 years.
=> We started learning E 6 years ago
2. It's three years since I last saw Nam.
=> I haven't seen Nam for three years
3. I last wrote to my uncle in July.
=> I haven't written to my uncle since July
4. Minh has collected stamps since 2000.
=> Minh began collecting stamps in 2000
5. It's a long time since we became close friends.
=> We have become close friends for a long time
6. I haven't gone to Da Lat for a long time.
=> I last went to Da Lat was a long time
7. The last time I visited my grandparents was last summer.
=> I haven't visited my grandparents since last summer
8. My family have lived in Lien Huong for 10 years.
=> My family started living in Lien Huong 10 years ago
9. I last saw him two days ago.
=> I have seen him for two days
10. How long have you bought this car?
=> When did you buy this car ?

Ex1:6. collect

Ex2: 3. written =))