条件状语从句PPT课件.ppt

期中备考之状语从句复习,Contents,回顾九种常用的状语从句,状语从句中常见的考点和难点归纳,历年中考考题中状语从句分析,天津市考试说明中的考试目标（状语从句部分）,条件状语,原因状语,目的状语,地点状语,比较状语,结果状语,时间状语,让步状语,方式状语,Back to school,难点,状语从句的时态问题;,难点,常考点,时间状语从句,各种从属连词的含义及用法比较；,状语从句的时态问题;,各种从属连词的含义及用法比较；,时间状语从句,状语从句的时态问题;,各种从属连词的含义及用法比较；,状语从句的时态问题;,各种从属连词的含义及用法比较；,时间状语从句,让步状语从句，条件状语从句,状语从句的时态问题;,各种从属连词的含义及用法比较；,引导条件状语从句的连接词主要有：if(如果)、unless(除非)或 as long as(只要)等。unless在意思上等于if.not。,条件状语从句,1、引导条件状语从句最常用的连词是if,由if引导的条件状语从句表示在某种条件下某事很可能发生。If you ask him,he will help you.如果你请他帮忙,他会帮你的。If you fail in the exam,you will let him down.如果你考试不及格,你会让他失望的。,条件状语从句,2、unless=if.not.除非,若不,Lets go out for a walk unless you are too tired.=If you are not too tired,lets go out for a walk.Unless it rains,the game will be played.除非下雨,比赛将照常进行。,条件状语从句,3、so/as long as只要You may borrow my book as long as you keep it clean.只要你保持书的清 洁，你就可以把我的书借去。So long as youre happy,it doesnt matter what you do.只要你高兴，你做什么都没有关系。,条件状语从句,二、时态问题在条件状语从句中，要注意主将从现的规定，即主句用一般将来时，从句用一般现在时表示将来时。I will come to see you if I have time.我有时间，我就来看你。常见考法对于条件状语从句的考查，多以单选和完形填空的形式，从时态的角度设题，考查学生灵活运用的能力，或从连词的意义角度让大家选择连词。,条件状语从句,典型例题：If he _in half an hour,we _wait for him.A.wont come,wont B.wont come,dontC.doesnt come,wontD.will come,dont解析：本题考查条件状语从句主将从现的运用。题干的意思是如果他一小时后不来，我们将不会等他了，从in half an hour，一小时后可知本句说的是未来的事，那么if引导的条件状语从句要用一般现在时表示将来时，主句要用一般将来时。答案：C,条件状语从句,1.Ifit_tomorrow,we_toclimbmountains.A.doesntrain;goB.wontrain;willgoC.wontrain;go D.doesntrain;willgo2Doyouknowif_tomorrowmorning?No.Iwillcallyouifshe_back.A.shewillcome;comesB.shecomes;willcomeC.willshecome;comesD.willshecome;willcome,条件状语从句,3Wellgototheparkifit_raintomorrow.A.dontB.doesntC.wont4Wearenotsureifit_tomorrow.Ifit_,oursportsmeetingwillbeputoff.A.rains;rains B.rains;willrainC.willrain;willrainD.willrain;rains,条件状语从句,误区提醒if 既可以引导条件状语从 句，表示如果，也可以引导宾语从句，表达是否。辨别它在这两种从句中的时态是我们经常容易出错的地方。另外，if 和unless的用法也需注意,条件状语从句,5.Illgivethebooktohimaslongashe_herenextSunday.A.willcomeB.comesC.iscomingD.came6.Youwillnotgetgoodgrades _ youworkhard.A.andB.unlessC.ifD.aslongas,条件状语从句,40.Will you please give the dictionary to Jane?Sure,Ill give it to her _ she arrives here.A.beforeB.until C.becauseD.as soon as,37.A snake bit him _ he went to see a doctor at once.A.if B.where C.because D.so,28.Youwillbelateforschool_youdontgetupearly.A.but B.if C.andD.or,34.It was raining heavily,_ we decided to stay at home and watch TV.A.but B.or C.because D.so,36._ the dinner was all over,everyone helped wash the dishes.A.How B.When C.Before D.Why,