1. If we meet at 9:30, we (have) ______will have___________plenty of time.
2. If you (find) ___find______________ a skeleton in the cellar, don't mention it to anyone.
3. The zookeeper would have punished her with a fine if she ( feed) _______fed__________ the animals..
4. If you pass your examination, we (have) _______will have__________a celebration.
5. Lisa would find the milk if she (look) ______looked___________ for it in the fridge.
6. What (happen) _____will be happen____________if I press this button?
7. The door will be unlocked if you (press)_____press____________ the green button.
8. I should have voted for her if I (have) ________have had_________ a vote then.
9. If you go to Paris, where will you stay___________?
10. If you (swim) _______swim__________ in this lake, you'll shiver from cold.
11. If someone offered to buy you one of those rings, which you (choose) __would choose _______________?
12. The flight may be cancelled if the fog (get) ____got_____________thick.
13. If the milkman (come) _________come________, tell him to leave two pints.
14. I (call) _____would call____________ the office if I were you.
15. Someone (sit) _______will sit__________on your glasses if you leave them there.
16. You would hear my explanation if you (not talk) _____didn't talk____________so much.
17. What will i do_____________if I hear the burglar alarm?
18. If you (read) _____read____________the instructions carefully, you wouldn't have answered the wrong question.
19. If Mel (ask) ____asked ________ her teacher, he'd have answered her questions.
20. I would repair the roof myself if I (have) _____had____________a long ladder.
21. Unless they turn that radio off, I (go) __________will go_______mad.
22. If you were made redundant, what would you do________?
23. We'll have a long way to walk if we (run) ______run___________out of petrol here.
24. If you shake that bottle of port, it (not be) ________won't_________ 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) ____would have____ so many accidents if you drove more slowly.
28. If you (wear) ___wore_______ a false beard, nobody would have recognized you.
29. If she (leave) ______leaves________ the fish here, the cat will eat it.
30. You (have) would have had____ 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) __wouldn't have 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 have brought_____ you some beer if I had known that you were thirsty.
37. If you had touched that electric cable, you (be) __would have been________ electrocuted.
38. If the story hadn't been true, the newspaper (not print) wouldn't have printed____ it.
39. I (not buy) __wouldn't bought______ things on the installment system if I were you.
40. Dan (arrive) ____would arive___ safe if he drove slowly.

Cho dạng đúng của động từ trong ngoặc. 
1. If we meet at 9:30, we (have) will have plenty of time.
2. If you (find) find a skeleton in the cellar, don't mention it to anyone.
3. The zookeeper would have punished her with a fine if she ( feed) had fed the animals..
4. If you pass your examination, we (have) will have a celebration.
5. Lisa would find the milk if she (look) looked for it in the fridge.
6. What (happen) will happen if I press this button?
7. The door will be unlocked if you (press) press the green button.
8. I should have voted for her if I (have) had a vote then.
9. If you go to Paris, where will you (stay) stay ?
10. If you (swim) swim  in this lake, you'll shiver from cold.