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49. He smokes too much; that's why he can't get rid of his cough.
→ If
50.She is very shy, so she doesn't enjoy the party.
→ If
51. Do your exercises or you will fail the exam.
=> If
52. Save some money or you won't able to buy the house.
=> If
53. Behave yourself or your parents will be very unhappy.
=> Unless
54. Do it carefully or you'll feel sorry afterwards.
=> If
55. Ask him first or he won't offer to help.
=> If
56. Be calm or you'll make a wrong decision.
=> Unless
57. Be careful or you'll cut yourself with that knife.
=> If
58. Ask him first or he won't offer to help
=> Unless
59. If he doesn't take more care, he'll have an accident.
-> Unless
60. The crops will be ruined if it doesn't rain soon.
-> Unless
61. Unless the weather is fine, we'll stay at home.
-> If
62. I can't go with you unless I get my work finished.
-> If
63. If you don't leave on the 15th, you'll get home late for your mother's party.
-> Unless
64. Tom never does anything unless his father tells him what to do.
-> If
65. If she does nothing to prepare for the test, she will get bad marks.
-> Unless
66. You can't visit the United States unless you get a visa.
>If
67. Unless you remember our address, you can find it in the phone book.
-> If
68. I would refuse to go unless they paid my expenses.
=> If
69. I don't agree with his economic policy. I wouldn't vote for him unless he changed it.
=> If
70. He wouldn't have written unless he had heard news.
=>If
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