条件状语从句课件

Grammar语法1：正确使用that,if/whether（是否）,who,why等疑问词引导的宾语从句。语法2：if（如果）引导的条件状语从句位置：从句可放在主句之前或之后，但是放在主句之前须有逗号隔开eg:如果我有足够的钱，我就去环游世界If引导条件状语从句定义：if“如果,假如”它引导的句子表示某事发生所需的条件，即“在…条件下，某事才能发生”，在句子中充当状语，因此称之为条件状语从句。（If引导的条件状语从句表示假如有从句的动作发生，就会有主句动作的发生）IfIhaveenoughmoney,Iwilltravelaroundtheworld=IwilltravelaroundtheworldifIhaveenoughmoneyif引导的条件状语从句时态主将从现祈使句情态动词IwillsingasongifIamhappy.Don’tcrosstheroadifthelightisredYoumuststopifthetrafficlightisred.用法：1.如果主句是祈使句，从句要用一般现在时。Don’tgoandplayfootballifyoudon’tfinishyourhomework.PleasecallmeifhecomesnextSunday.if（如果）引导的条件状语从句:2.如果主句是一般将来时，if从句则用一般现在时。Ifitrains（从句），Iwillstayathome.I’llgowithyouifyoudon’twanttogoalone（从句）.3.如果主句含有must,may,can等情态动词，if从句也要用一般现在时。Ifyoudrivetoofast,youmayhaveanaccident.Youmuststopifthetrafficisred.1.Ifyou____(want)tolistentomusic,_____(choose)aCD.2.Ifyou___(buy)anewcamera,____(get)agoodone.3.Ifthelight___________(notcome)on,____(wait)foroneminute.4.Ifit___________(notwork),_____(wait)aminuteandthen_____(try)again.5.Ifyou________(notknow)howtousethecamera,____(read)theinstructions.wantchoosebuygetdoesn’tcomewaitdoesn’tworkwaittrydon’tknowreadCompletethesentences.1.I’msureifhe_____(go)totheparty,he________(have)agreattime.2.Iftherain_______(stop)tonight,wewillgotothecinema.3.I’llbuyacomputerifI______(have)enoughmoney.4.You_________(notget)nervousifyou_____(do)enoughexercise.5.Iwanttoknowifhe_________(come)tomorrow,ifhe_______(come),I__________(give)themassagetohim.goeswillhavestopshavewon’tgetdocomeswillcomewillgive•I__________(record)theCDforyoutomorrow.•Doessheoften_______(lend)moneytoherbrother?•Thesnake_____________(notappear)ifyoumakenoise.•Shealways_______(warn)younottowatchTVintheevening.•Inthefinalexam,I_______(get)goodmarks.willrecordlendwon’tappearwarnswillget