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1. If you don't promise to return back, I won't lend you.
2. If Sally hadn't been absent from school on Friday, she would know what she has to do for homework.
3. Unless you like this one, I'll bring you aother.
4. But for Martin's nervousness, he wouldn't have failed his driving test last week.
5. Had it not been for his young death, he would be a famous musician.
6. If I had had breakfast, I wouldn't be hungry now.
7. If I had known you were busy, I wouldn't have disturbed you.
8. If I knew something about plumbing, I would have fixed the leak in the sink myself.
9. If you hadn't talked to me about my problems last night, I wouldn't feel better now.
10. Were I you, I wouldn't do that.
11. Should you need to reach me, I'll be at the Hilton Hotel in Seoul.
12. Had it been better prepared, she would have gotten the job.
13. Had they realized the danger, they would have done it differently.
14. Were I you, I would look for another job.
15. Were she ever in trouble, I'd do anything I could do to help her.
Câu đk loại 1 : If S Vs/es, S will V
Câu đk loại 2 : If S V2/ed, S would V
Câu đk lọai 3 : If S had V3/ed, S would have V3/ed
Đảo ngữ đk loại 1 : Should S V, S will V
Đảo ngữ đk loại 2 với tobe : Were S...., S would V
Đảo ngữ đk loại 3 : Had S V3/ed, S would have V3/ed
Unless = if...not