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1、条件状语从句常用引导词：if,unless,as/solongas1、if从句+祈使句，“如果……，就……”Ifyoudonotfeelwell,pleasegotoseethedoctor.如果你感觉不舒服，就去看医生吧。Ifyouwanttoknowmoreaboutit,callnow.如果你想了解更多内容，现在就打电话吧。MakesureyouvisittheScienceMuseumifyouevergotoLondon.如果你去伦敦，一定要去参观科学博物馆。2、主将从现IfIstartafterdinner,I’llfinishitbeforeIg
2、otobed.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”Shemaycomewithusifshearrivesintime.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Hurryup,oryou’llbelate.=Ifyoudon’thurryup,you’llbelate.Studyhardandyouwillpasstheexam.=Ifyoustudyhard,youwillpasstheexam.练习（一）句型转换1.Runfast,oryou’llbelateforschool._______y
3、ou______________fast,you’llbelateforschool.2.Youcanbuythedictionaryifyoutakeenoughmoneywithyou.Takeenoughmoneywithyou,_____________________buythedictionary.3.Ifthereisnoair,noneofuscanlive.Noneofuscanlive______________.4、unless“除非”Don’tleavethebuildingunlessItellyouto.不要离开大楼，除非我准许。U
4、nlessyouhavefinishedyourhomework,Iwon’tallowyoutowatchTV.除非你已完成了作业，否则我是不会让你看电视的。unless=ifnotYou’llbelateifyoudon’thurry.=You’llbelateunlessyouhurry.Ican’tcatchthetrainifIdon’tgetupearly.=Ican’tcatchthetrainunlessIgetupearly.练习（一）ifnot与unless相互替换1.HewillnotgounlessIcomewithher.______
5、_______________________________________2.Ifyoudon’tfinishit,Iwillbeangry._____________________________________________3.UnlessIammistaken,I’veseenthatmanbefore._____________________________________________4.Youwon’tgetagoodjob,unlessyouworkhard.______________________________________
6、_______5.Unlessthestrikehasbeencalledoff,therewillbenotrainstomorrow.__________________________________________________________5、as/solongas只要Youmayusemydictionaryas/solongasyoudon’tkeepittoolong.只要使用时间不太长，你可以用我的词典。Youcantakemycaras/solongasyoudrivecarefully.你可以用我的汽车，只要你小心点儿开。练习（一）用
7、if或unless填空1.________hewantstoseeme,youcantellhimtowait.2.________itsnowstomorrow,we’llhaveadayortwooff.3.Wewon’tgotohisparty________heinvitesus.4.Sheissuretopasstheexamination________sheisill.5.I’lltakethatcomputer________Ihaveenoughmoney.6.________mygrandmawearsglasses,shecanseebe
8、tter.7.Iwon’tbuytha
