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8. If the sun didn't always shine, everything on the earth wouldn't grow well.
9. If I had a typewriter, I could type it myself.
10. If I buy a new hat, I will give it to you.
11. If you ask the teacher, he will explain the lesson to you.
12. If Mary saw the sight, she could tell you about that.
13. If I had seen the signal, I would have stopped.
14. If I had known your number, I would have rung.
15. If he had shaved more often, he would have looked a lot better.
16. If she hadn't been ill, she would have gone to work.
17. If it hadn't been raining all morning, we would have gone out.
18. If he hadn't been tried, he wouldn't have made a mistake.
19. If Peter had written to me, I would have written to him.
20. If you had asked Alice, she would have told you the truth.
Câu đk loại 1 : If S Vs/es, S will V
Câu đk loại 2 : If S V2/ed, S would V
Câu đk loại 3 : If S had V3/ed, S would have V3/ed