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1、if引导的条件状语从句.(1)if从句的构成当我们要表示“如果……”时,就会用到if引导的条件状语从句。if引导的条件状语从句表示在某种条件下某事很可能/不可能发生。它的构成有：if从句（一般现在时）+祈使句if从句（一般现在时）+陈述句（将来时）Ifyouneedhelp,pleasecallme.Ifyouwanttoknowmoreaboutit,pleasetelephoneourteacher.Ifitrainstomorrow,wewillnotgotothezoo.Shewillcometoseeme
2、ifshehastime.其中if引导的是一个完整的句子，一定要有主语。.(2)if从句的位置if引导的条件状语从句既可放在主句之后,又可放在主句之前(但须用逗号隔开)。Printthetextifyoulikeit.Ifyoulikethetext,printit.Lookattheblackboardifyoucan’trememberthewords.Ifyoucan’trememberthewords,lookattheblackboard..时态主将从现主将从现指if条件状语从句用一般现在时，主句用一般将
3、来时。Ifitdoesn’traintomorrow,we’llgotothepark.Ifyoudon’tgetupearly,youwillbelateforschool.IfIplaygamesonit,itwillgowrong.主情从现即主句是含有情态动词的句子，从句仍然是一般现在时的句子。Ifallyouranswersareright,youcangotoHainanforholiday.Youmaystaytodinnerifyoulike..If引导的条件状语从句VSif引导的宾语从句Hewill
4、callyouifhecomesback.如果他回来，他会给你打电话。（此句if表如果，是条件状语从句，所以用主将从现。）Idon’tknowifhewillcomeback.我不知道他是否会回来。（此句if表是否，相当于whether，引导宾语从句,所以不遵循主将从现，应根据实际情况选择时态。）.Exercise1.Ifit_____finetomorrow,we____apicnic.A.be;haveB.is;willhaveC.willbe;willhave2.Ifyoubringsnackstothepa
5、rty,theteachers___________.A.takeitaway B.willtakethemawayC.tookawaythem3.Iwillgivethebooktohimifhe_________herenextSunday.A.comeB.willcomeC.comes4.Idon’tknowifhe__________heretomorrow.A.willcomeB.comesC.comeBBCA.如果我有足够的钱，我将环游世界。IfI___________________,I_______
6、__________________.如果你累了，休息一下。Ifyouaretired,_________________.如果我们找不到公交车，我们可以走去那里。Wecanwalkthereifwe_________________.如果你想了解它是怎样工作的，请阅读说明。Ifyou_________________________,please____________________.如果你告诉她真相，你将证明你是多么诚实。Ifyou________________________,you___________
7、____________________.tellherthetruthwillprovehowhonestyouarehaveenoughmoneywilltravelaroundtheworldhavearestcan’tfindabuswanttoknowhowitworksreadtheinstructions.Page.44Part.5turnonwillhearfollowcalldon’tknowwillsendwillgivewillwinwillnotchoose.Page.44Part61.--
8、-WhatshouldIdoifIwanttoworkinradio?---Youshouldkeepstudyinghard.2.---WhatshouldIdoifIwanttofindtheinformation?---YoushouldusetheInternet.3.---WhatshouldIdoifIwanttomakefriends?---Y
