23. We'll have a long way to walk if we (run) ______don't rin___________out of petrol here.

24. If you shake that bottle of port, it (not be) ____won't be_____________ fit to drink.

25. If you spoke louder, your classmates (understand) ____would understand_____________ you.

26. I'll probably get lost unless he (come) ____comes_____________with me.

27. You (not have) ____wouldn't have_____________ so many accidents if you drove more slowly.

28. If you (wear) _______worn__________ a false beard, nobody would have recognized you.

29. If she (leave) _______doesn't leave__________ the fish here, the cat will eat it.

30. You (have) _______wouldn't__________ no trouble at school if you had done your homework.

31. Unless you (tell) ______tell____________ the truth, I won’t help you.

32. You'll get pneumonia if you (not change) _____don't change____________ your wet clothes.

33. If I had known that you couldn't eat octopus, I (not buy) ____didn't buy_____________ it.

34. If they (hang) _________hung________ that picture lower, people would be able to see it.

35. She (be) _______would be__________able to walk faster if she didn’t have such high-heel shoes.

36. I (bring) ____would bring_____________ you some beer if I had known that you were thirsty.

37. If you had touched that electric cable, you (be) _____would be____________ electrocuted.

38. If the story hadn't been true, the newspaper (not print) ___wouldn't print______________ it.

39. I (not buy) _________wouldn't buy________ things on the installment system if I were you.

40. Dan (arrive) ___would arrive______________ safe if he drove slowly.

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Các cấu trúc sử dụng trong bài:

câu ĐK loại 1: If + S + V(hiện tại đơn), S+ will/won't + V(nguyên thể)

=>Dùng để diễn tả một sự việc có khả năng xảy ra trong tương lai.

Câu ĐK loại 2: If + S + V(quá khứ đơn), S + would/wouldn't + V(nguyên thể)

=> Dùng để diễn tả điều ước, lời khuyên, hoặc sự việc có thể xảy ra trong quá khứ, nhưng đã ko xảy ra.