高三英语一轮复习if引导的条件句课件

高中英语语法

—if引导的条件句由if引导的条件状语从句表示在某种条件下某事很可能发生。1.Ifyouaskhim,hewillhelpyou.如果你请他帮忙，他会帮你的。2.Ifyoufailintheexam,youwilllethimdown.如果你考试不及格，你会让他失望的if引导的条件状语从句既可以将从句放前面也可以将从句放后面（如果天下雨，我们就不玩了）Ifitrains,wewillstopplaying.‘转为Wewillstopplayingifitrains.if从句还表示不可实现的条件或根本不可能存在的条件（虚拟或假设）从句多用一般过去时或过去完成时。IfIwereyou,Iwouldinvitehimtotheparty.如果我是你，我会邀请他参加聚会。IwouldhavearrivedmuchearlierifIhadnotbeencaughtinthetraffic.如果没有堵车，我会到的早一点儿。分级练习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