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1) He is very slow, so we won't give his such an important task.
-> If he isn't slow, we will give his such an important task.
2) If you don't promise to try harder, i won't help you
->Unless you promise to try harder, I won't help you.
3) If didn't win a big prize in a lottery, i wouldn'tgive up my job
->Unless I won a bif prize in a lottery, I wouldn't give up my job.
4) Bill failed the test because he didn't study carefully
->If Bills had studied carefully, he wouldn't have failed the test.
5) The dress is very expensive, so she can't but it ( ở đây chắc là buy =))
->If the dress were cheap, she could buy it.
6) She wasn't able to answer the questions, so she failed the exam
->If she had been able to answer the questions, she wouldn't have failed the exam.
7) If he doesn't study hard, he won't get good mark
->Unless he studies hard, he won't get good mark.
8) He doesn't get a job, so he can't pay his bills
->If he gets a job, he can pay his bills.
9) Save your money or you won't be able to buy the house
->If you save you money, you will be able to buy the house.
10) We missed the train because the clock wasn't right
->If the clock had been right, we wouldn't have missed the train.
#Chúc_bạn_học_tốt_jasss
Biến đổi câu
1. If I were you, I wouldn't trust him. ( viết sai chính tả 
)
You'd better not trust him.
2. She couldn't take part in the competition because she was ill.
Her illness prevented er from taking part in te competition.
3. I find it difficult for me to find a better solution.
I have difficulty in finding a better solution.
4. The door was so heavy that the boy couldn't open it.
It was such a heavy door that the boy couldn't open it.
Tick cho công người làm nhen ☺
1. If he __listened___ (listen) to me, he would have got the job.
2. The tree was dead because it __was___ (be) arid all summer.
3. I __have met___ (meet) him somewhere before.
4. Linh told me she ___studied__ (study) a lot before the exam.
#Yumi
1 Had listened
*câu điều kiện loại 3
If s+had Vp2, s+would+have Vp2
2 was.
* vì ở mệnh đề trc là thì qk nên ở mệnh đề sau cx ở thì quá khứ
3 have met
* before thường đc xuất hiện ở thì htht
4 studied
*Theo đúg cấu trúc câu gián tiếp. Từ thì hiện tại xuống quá khứ