高中英語(yǔ)語(yǔ)法

—if引導(dǎo)的條件句由if引導(dǎo)的條件狀語(yǔ)從句表示在某種條件下某事很可能發(fā)生。1.Ifyouaskhim,hewillhelpyou.如果你請(qǐng)他幫忙，他會(huì)幫你的。2.Ifyoufailintheexam,youwilllethimdown.如果你考試不及格，你會(huì)讓他失望的if引導(dǎo)的條件狀語(yǔ)從句既可以將從句放前面也可以將從句放后面（如果天下雨，我們就不玩了）Ifitrains,wewillstopplaying.‘轉(zhuǎn)為Wewillstopplayingifitrains.if從句還表示不可實(shí)現(xiàn)的條件或根本不可能存在的條件（虛擬或假設(shè)）從句多用一般過(guò)去時(shí)或過(guò)去完成時(shí)。IfIwereyou,Iwouldinvitehimtotheparty.如果我是你，我會(huì)邀請(qǐng)他參加聚會(huì)。IwouldhavearrivedmuchearlierifIhadnotbeencaughtinthetraffic.如果沒(méi)有堵車(chē)，我會(huì)到的早一點(diǎn)兒。分級(jí)練習(xí)Areyouready?FIRSTSECONDTHIRDZEROIf

I

am

lateforschool,myteachergets

angry.IfclauseMainclauseIf+PresentsimplePresentsimpleIfIoversleep…Imissthebus.IfImissthebus,Iamlateforschool.IfIamlateforschool,myteachergetsangry.If

I

go

toLondon,Iwill

see

theBigBen.IfclauseMainclauseIf+Presenttensewill/can/may/must+verb

IfIgotoLondon…IwillseetheBigBen.IfIgotoBuckinghamPalace,IcantakeaphotooftheRoyalGuard.IfyougotoLondon,youmust

look

rightbeforecrossingastreetIfclauseMainclauseIf+PastSimplewould/could/might+verbIfIwereanastronaut,Iwouldtravelinaspaceship.IfIwereanastronaut,Iwouldtravel

inaspaceship.IfItravelledinaspaceship,Iwouldgo

toMars.Nicetomeetyou!IfIwenttoMars,Iwouldmeet

aMartian.IfImetaMartian,Iwouldn’tunderstand

him.?IfIavedIfIdidn’tunderstandhim,Iwouldcome

backtotheEarth.If

I

hadstudiedhard,Iwouldhavepassedmyexams.IfclauseMainclauseIf+PastPerfecttensewould/could/might+have+pastparticiple

IIfyouhadstudiedhard,youwouldn’thavefailedyourexam.IIfyouhadpassedyourexam,youc