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1、if引导的真实条件句Module4Unit7Memory真实条件句表示现实情况中可能实现的情况。真实条件句中的谓语动词一般用一般现在时代替一般将来时，用一般过去式代替过去将来时。句式为（If +从句,+主句）中文意思是“如果某事发生（或不发生），另一事就（不）发生”。主句：即句子的主体,能单独使用或出现的句子从句:是复合句中不能独立成句，但具有主语部分和谓语部分If itrainstomorrow, I will stay at home.Theysaidtheywould letus knowif theyheardany
2、news about him.ExplanationsExamples时态①如果主句用的是一般将来时if引导的条件状语从句常用一般现在时。②如果主句是祈使句，从句也常用一般现在时。③如果主句含有情态动词，从句一般也用一般现在时。1.I will visit my grandma if I am free.2.Let’s go shopping if you are not busy.3. You must be careful ifyou go swimming in the river.语序if引导的条件状语从句可以放在主句
3、前面，常用逗号隔开；也可以放在主句的后面。If you don’t hurry, you will be late.= You will be late if youdon’t hurry.转换①“祈使句+and(or)+陈述句”在意义上相当于一个含有条件状语从句的复合句。②“if+否定句”相当于“unless+肯定句”。Hurry up, or you’ll be late. = If you don’t hurry up,you’ll be late. Don’t comein if I don’t call you.=
4、Don’t come in unless Icall you.【中考链接】1. —I hear Jack Chan will come to Laiwu next week.—Really? __ he comes, my younger sister will be very happy.A. If B. Until C. Unless D. BeforeKey:A2. I don’t know if it ______ tomorrow. If it ______, we won’t goon a picnic.A.
5、 rains; rains B. will rain; rains C. will rain; will rain ( )Key:B3. We will have no water to drink _______ we don’t protect theearth.A. until B. before C. though D. ifKey:D【单项选择】1. We will stay at home if my aunt ______ to visit us tomorrow. A. come B. come
6、s C. will come D. is comingKey:B2. —Do you know if he ______ to play basketball with us?—I think he will come if he ______ free tomorrow.A. comes; is B. comes; will beC. will come; is D. will come; will beKey:C3. You will keep healthy ______ you do more exer
7、cise, such as running and swimming.A. if B. how C. before D. whereKey:A【每空一词】1.如果明天不下雨的话，我们将去动物园。We will go to the zoo ______ ______ ______ ______ tomorrow.Key:ifitdoesn’train2.如果你完成了作业，我们就去下象棋。______ ______ ______ ______ ______, let’s go to play chess.Key:I
8、fyoufinishyourhomework3.如果人人都能保护环境，世界将会变得更美好。If everyone protects the environment, the world ________ ____ _____.Key:willbecomemorebeautif
