Unit10if引導(dǎo)條件狀語從句課件人教版英語八年級上冊

If引導(dǎo)條件狀語從句英語人教版八年級上冊Unit10

什么是條件狀語從句？定義：if“如果,假如”它引導(dǎo)的句子表示某事發(fā)生所需的條件，即“在...條件下，某事才能發(fā)生”，在句子中充當(dāng)狀語，因此稱之為條件狀語從句。(if引導(dǎo)的條件狀語從句表示假如有從句的動作發(fā)生，就會有主句動作的發(fā)生。)Ifitrainstomorrow,Iwillstayathome.Iwillstayathomeifitrainstomorrow.從句在主句前時,____(用/不用)逗號隔開；當(dāng)主句在前時，則_____(用/不用)逗號。用不用Position(位置）ifclausemainclausemainclauseifclause如果我有足夠的錢，我就去環(huán)游世界。

IfIhaveenoughmoney,Iwilltravelaroundtheworld.=IwilltravelaroundtheworldifIhaveenoughmoney.Translation:Readandsummarize讀下列例句，總結(jié)if的用法Ifitisfinetomorrow,wewillgotothepark.IwillgotothelibraryifIfinishmyhomeworkbeforeteno'clock.用法一：主句是一般將來時，從句用一般現(xiàn)在時。（主將從現(xiàn)）Ifyoufinishyourhomework,youcangohome.Ifyouwanttoloseweight,youmusteatlessbread.Youmuststopifthetrafficlightisred.用法二：主句含有must,may,can等情態(tài)動詞，從句也要用一般現(xiàn)在時。（主情從現(xiàn)）用法三：主句是祈使句，從句也要用一般現(xiàn)在時。（主祈從現(xiàn)）Exercises：willstaywon’tgostartfinishdon’twantLookandsaygetuplatelateforschoolIfyougetuplate,you’llbelateforschool.youIfIhavealotofmoney,Iwillbuy

abighouse.I我Ifsheishard-working,shewillgetgoodgrades.IfitissunnythisSunday,wewillgo

fishing.weIfI'mill,IwillseeadoctorillseeadoctorI我Attention注意事項在if引導(dǎo)的條件狀語從句中,當(dāng)主句是一般將來時時，要用will＋v，不能用begoingto結(jié)構(gòu)。eg:IwillhelpyouwithyourEnglishifIamfreetomorrow.同義句轉(zhuǎn)換1、借助“祈使句＋and/or＋簡單句”句型來轉(zhuǎn)換。其中and表示順承關(guān)系，or表示轉(zhuǎn)折關(guān)系。Ifyoustudyhard,you’llpasstheexam.=Studyhard,andyou’llpasstheexam.Ifyoudon’thurryup,you’llbelate.=Hurryup,oryouwillbelate.同義句轉(zhuǎn)換2、借助介詞with或without來轉(zhuǎn)換。Ifyouhelpme，Iwillfinishmyworksoon.=Withyourhelp，Iwillfinishmyworksoon.Ifthereisnowater,fishwilldie.=Withoutwater,fishwilldie.If的兩面性(兩個意思)1、if:“如果”,引導(dǎo)條件狀語從句IwillgotothecinemaifIamfree

tomorrow.主將從現(xiàn)2、if:“是否”,引導(dǎo)賓語從句Practice1.BettywillvisittheHistoryMuseumifit_________(notrain)tomorrow.doesn’train如果2.Benwantstoknowifit_______(be)finetomorrow.willbe是否除了if之外，是否還有其他連詞可以引導(dǎo)條件狀語從句1、unless除非，如果不...Unlessheinvitesme，Iwon’tgotohisparty.2、as(so)longas...“只要...就...”Youwillgetgoodgradesaslongasyoustudyhard.=Ifhedoesn’t

inviteme,Iwon’tgotohisparty.Tellastorywith“if”:IfIgetbadgrade,myparentwillbeangrywithme.Ifmyparentisangrywithme,Iwillbesad.Summary:if條件句不一般，幾個要點(diǎn)記心間；條件句，放在