条件状语从句

1、条件状语从句引导词：if / unless条件状语从句遵循：“主将从现”neg: If it rains tomorrow, I shant (wont ) climb the hills.n I shant (wont) climb the hills if it rains tomorrow.n主句：主句：I shant (wont) climb the hills.n从句：从句：If it rains tomorrow.主句是祈使句或有情态动词，从句也用一般现在时neg: Please call me if he comes next Sunday.n nCan you call the

2、 policeman if you are in trouble?if的含义n “如果，假如如果，假如” （条件状语从句）（条件状语从句）neg: If you work nhard, you will npass the exam.n是否是否”=whether (宾语从句）宾语从句）neg:I dont know if it will rain tomorrow.unless“除非.”“非.不可”n注意：注意：unless从句里从句里的谓语只能是肯定式，的谓语只能是肯定式，因为本身因为本身unless表示表示否定。否定。neg: You will fail unless you work h

3、ard.n 判断正误：判断正误：n 1. Unless you do not work, you will fail. ( )n 2. Unless you finish your homework, I will see a film myself. ( )unless从句和if从句的互换：n如果你不努力工作，你将会失败的。如果你不努力工作，你将会失败的。nIf you dont work hard, you will fail. (同义句转换）同义句转换）nUnless you work hard, you will fail.语法精炼：（ ）1. The volleyball match

4、 will be put off if it_.n A.will rain B.rains C.rained D.raining ( ) 2. Difficulties are nothing if we _not afraid of them. A.will B.shall C.are D.do ( ) 3. We _ to Beijing tomorrow if it doesnt rain. A.are going B.would go C.be go D.will go ( ) 4. I dont like to be interrupted if I_. A.speaks B.wil

5、l speak C.am speaking D.spoke ( ) 5. If you _ the book you will understand the story better. A.have read B.will be reading C.will have read D.reads( ) 6. Be careful, if you _ want to make mistakes. A.wont B.dont C.didnt D.not( ) 7. Work hard if you _ to get a good mark. A.wanted B.wanting C.want D.will want( ) 8. -I want to know if you _ to the party tomorrow. -I will if I _ free. A.will come; am B.come;am C.will come;will be D.come; will be( ) 9. If you _ a chance to study in a foreign country, just take it. A.getting B.had not C.will get D.g