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1、Unit 10 If you go to the party, youll have a great time单元语法小专题（Grammar Focus）语法精讲2if引导的条件状语从句的用法条件状语从句通常由连词if引导，意为“如果、假如”，表示在某种条件下，很可能会发生某种事情。1.if条件状语从句的位置在 if 引导的条件状语从句中，if 条件句位置灵活，可直接放在主句后面，若 if 条件句放句首， 从句后面要加逗号，和主句隔开。如：If I have time tomorrow, Ill go to the countryside with my friends.= Ill go to
2、 the countryside with my friends if I have time.如果我明天有时间，我将和我的朋友们去乡下。2.if条件状语从句的时态搭配if 引导条件状语从句，主句用一般将来时，从句则用一般现在时。如：If it rains tomorrow, I wont climb the hills.如果明天下雨，我就不爬山。温馨提示：在if 引导的条件状语从句中，有时根据句意的需要主句可能用到情态动词。如：If you finish your homework, you can watch TV.如果你完成了家庭作业，你可以看电视。3.if引导的条件状语从句与if引导的
3、宾语从句的区别 if 引导的条件状语从句，if意为“如果”，主句用一般将来时，从句则用一般现在时；if引导宾语从句时，if意为“是否”， 相当于 whether，时态需根据语境确定。如：I dont know if it will rain tomorrow.我不知道明天是否会下雨。if条件状语从句用法歌诀：if 条件句不一般,几个要点记心间;条件句,放在前,逗号要放句中间。条件句，表可能，主句多用将来时；条件句，表事实，主句常用现在时。4.与其他句式之间的句型转换(1)借助“祈使句+and (or)+一般将来时的句子”这一句型来转换。and在句意上表示顺承关系，or表示转折关系。如：If y
4、ou get up early,youll get there on time.= Get up early,and youll get there on time.=Get up early,or you wont get there on time.早点起床，你就会准时到那里。(2)借助介词without或with来转换条件状语从句。如：If there is no water, fish will die.=Fish will die without water.如果没有水，鱼就会死。If you help me, Ill finish the work soon.= With your
5、 help, Ill finish the work soon.如果你帮助我，我就会快点完成工作。语法精练.用括号内所给单词的适当形式填空。1.I_ (buy) you a computer if you get good grades.2.We_ (not go) there if he doesnt agree.3.You will win the match if you _(practice) hard.4.Please call me if you_ (have) any questions.5.You may go swimming if you_ (finish) your ho
6、mework.单项选择。( )6.Do you know when he will come back tomorrow?Sorry,I dont know.When he _ back,Ill tell you.A.comes B.will come C.come D.may come ( )7.Mary will go to Sanya if she _ a five-day trip.A.have B.had C.will have D.has( )8.What will you do if you to the party without invitation? A.go B.went
7、 C.going D.will go ( )9.If I eat too much food, I _ too fat.A.am B.was C.will D.will be( )10.Ill give the book to him if he _ here next Sunday.A.will come B.comesC.is coming D.came.改为同义句，每空一词。11.Study hard, or you wont pass the exam.If you study hard, you _ _ the exam.12.Take a taxi,and youll catch
8、the train. _ you _ a taxi, youll catch the train.13.If you dont help me, I cant catch up with the others.I cant catch up with the others_ _ _ .14.Use your head and youll have a good idea. _ you _ your head,_ have a good idea.15.If you are late,the teacher will be angry._ _ late, _ the teacher will be angry.单元语法小专题（Grammar Focus）.1.will buy2.wont go3.practice4.have5.finish.6-10ADADB.11.will pass 12.If;take 13.without your help 14.If;use;youll 15.Dont be; or
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