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条件状语从句常用引导词：if, unless, as/so long as1、if 从句 + 祈使句，“如果，就”If you do not feel well, please go to see the doctor. 如果你感觉不舒服，就去看医生吧。If you want to know more about it, call now. 如果你想了解更多内容，现在就打电话吧。Make sure you visit the Science Museum if you ever go to London. 如果你去伦敦，一定要去参观科学博物馆。2、主将从现If I start after dinner, Ill finish it before I go to bed. 如果我晚饭后开始，睡觉前我就能完成。主句也可用“情态动词 + 动词原形”She may come with us if she arrives in time. 如果她来得及时，就可以和我们一起去。3、if条件状语从句和并列句的转换Hurry up, or youll be late. = If you dont hurry up, youll be late. Study hard and you will pass the exam. = If you study hard, you will pass the exam.练习（一）句型转换1. Run fast, or youll be late for school. _ you _ _ fast, youll be late for school.2. You can buy the dictionary if you take enough money with you. Take enough money with you, _ _ _ buy the dictionary.3. If there is no air, none of us can live. None of us can live _ _.4、unless “除非”Dont leave the building unless I tell you to. 不要离开大楼，除非我准许。Unless you have finished your homework, I wont allow you to watch TV. 除非你已完成了作业，否则我是不会让你看电视的。unless = if notYoull be late if you dont hurry. = Youll be late unless you hurry. I cant catch the train if I dont get up early. = I cant catch the train unless I get up early.练习（一）if not与unless相互替换1. He will not go unless I come with her. _2. If you dont finish it, I will be angry. _3. Unless I am mistaken, Ive seen that man before._4. You wont get a good job, unless you work hard._5. Unless the strike has been called off, there will be no trains tomorrow._5、as/so long as 只要You may use my dictionary as/so long as you dont keep it too long. 只要使用时间不太长，你可以用我的词典。You can take my car as/so long as you drive carefully. 你可以用我的汽车，只要你小心点儿开。练习（一）用 if或unless填空1. _ he wants to see me, you can tell him to wait.2. _ it snows tomorrow, well have a day or two off. 3. We wont go to his party _ he invites us. 4. She is sure to pass the examination _ she is ill. 5. Ill take that computer _ I have enough money.6. _ my grandma wears glasses, she can see better. 7. I wont buy that backpack _ it costs less than $20 8. _ Im tired; Ill have a rest for tea. 9. You wont get paid for time off _ you have a doctors note. 10. You will get a toothache _ you do clean your teeth regularly.（二）用所给单词的适当形式填空1. If he _ (get) a low mark in the test, he _ (study) harder.2. If you _ (swim) every day this summer, you _ (be) very healthy.3. If he _ (not hurry), he _ (not see) the beginning of the match.4. You cant go out unless you _ (finish) your homework.5. Unless I save my money carefully, I _ (not be) able to buy a football.6. If it _ (not rain) tomorrow, we _ (go) to the park.7. If he _ (return) to the school, I _ (let) you know.8. He _ smoke unless he _ (have) enough money.9. They can remember it better if someone _ (give) them some advice about it.10. The man _ (set off) if he _ (buy) the air ticket.（三）单项填空1. If I _ his phone number, I will tell you.A. findB. foundC. will findD. have found 2. We will go camping if it _ tomorrow. A. Wont rainB. didnt rainC. doesnt rainD. isnt raining 3. Im waiting for my friend. If he _, I _ swimming alone.A. doesnt come; will goB. wont come; will goC. will come; wont goD. dont come; will go4. _ you go to the supermarket at 7 p.m., you can buy a lot of cheap food.A. IfB. UnlessC. WhetherD. When 5. I wont get to the party on time _ I catch the first train tomorrow morning.A. IfB. UnlessC. WhetherD. When 6. Shall we go on a picnic this weekend? Good idea! Unless it _.A. rainsB. doesnt rainC. rainD. wont rain 7. Can I change the jacket for another one _ it doesnt fit me well? Of course. A. unlessB. ifC. thatD. though 8. Nobody can learn maths well _ he works hard on it. A ifB unlessC thoughtD however 9. If fish _ away from water, they _ die. A are taking, wontB are taken, willC are being taken, willD take, wont10. Each student can ask teachers for help if he _ how to work out the problem. A will knowB wont knowC dont knowD doesnt know
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