【语法】条件状语从句表将来肯定会发生的事-完整版课件

条件状语从句表将来会发生的事Lead-in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）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:如果你把盐放在水里，它会消失.Ifyouputsaltintowater,itdisappears.=Itdisappearsifyouputsaltintowaterif引导条件状语从句Presentation句式结构和时态Ifyoutakeafishoutofwater,itdies.Youwillbelateforschoolifyoudonotleavenow.从句：一般现在时主句：一般现在时从句：一般现在时主句:一般将来时（will)句式结构：if从句，+主句./主句+从句.时态：1.主现从现2.主将从现Presentation1.如果我把玻璃杯扔掉，它就会摔碎。IfI

aglass,it

.dropbreaks3.If从句用一般现在时，主句也用一般现在时，表示客观事实或习惯。4.口诀：主现从现2.如果你浇植物，它就会生长。Ifyou

aplant,it

.growswater4.Ifyouputwoodintowater,it

.Practice1.Ifyoutakeafishoutofwater,it

.2.Ifyouputsaltintowater,it

.3.Ifyouswitchoffthelamp,theroom_____

dark.diesdisappearsfloatsbecomesPresentationIfI’mhungry,Iwill______________.eatsomefoodPresentationIfitrainstomorrow,I_____________________.willwatchTVathomeIwon’t________________.playbasketballPresentationIfit_____________tomorrow,________________.I’llplaybasketballdoesn’train1.If从句用一般现在时，主句用一般将来时。2.口诀：主将从现Presentation1.Wewillhaveapicnictomorrow,ifit

.2.We__________(play)football,Ifitis_________(sun).3.He_________(watch)TV,ifhe______(be)free.willplaysunnywillwatchisdoesn’train4.Ifshe________alittleearlier,she’llhavetimetoeatbreakfastathome.getsupPresentation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。

1.Ifyoufinishthehomework，youcangohome．如果你作业做完了就可以回家了。2.

Ifyouwanttoloseweightyoumust/shouldeatlessbread.

如果你想减肥，你必须少吃面包。Presentation1.Don’tgoandplayfootballifyoudon’tfinishyourhomework.如果你不完成你的作业，不要去踢足球。2.PleasecallmeifhecomesnextSunday.如果他下星期六来，请给我打电话。

如果主句是祈使句，if从句同样要用一般现在时。Presentation1.Ifyou

toofast,youmayhaveanaccident.A:drivesB:driverC:driveD:drove2.Youmuststopifthetraffic

red.A.is B.beC.areD.willbe3.

Hurryup,oryou

belate.A.willB.areC.mayD.can4.Workhard，________youmaycatchupwithyourclassmatessoon.A.or B.butC.andD.yetCAACPresentation要领：unless=if…not条件状语从句：unless从句遵循if从句主将从现和主现从现的情况。unless如果不，除非

条件状语从句：If从句unless从句时态口诀：1.主现从现2.主将从现unless引导条件状语从句PresentationYouwillbelateforschoolIfyoudo

not

leavenow.unless

youleavenow.要领：unless=if…notPresentation1.Ifyoudonotimproveyourhandwriting,youwilllosemarksintheexam.=Unlessyouimproveyourhandwriting,youwilllosemarksintheexam.=Youwilllosemarksintheexamunlessyoudonotimproveyourhandwriting.Presentation2.Youwillgetatoothacheifyoudonotbrushyourteetheveryday.=Unlessbrushyourteetheveryday,youwillgetatoothache.=Youwillgetatoothacheunlessbrushyourteetheverydayyouwillgetatoothache.Practice3.Iwillleavethisrestaurantifthewaiterdoesnotcomesoon.=Unlessthewaitercomesoon,Iwillleavethisrestaurant.=Iwillleavethisrestaurantunlessthewaitercomesoon.Practice1、（2010上海）Wewillhavenowatertodrink

wedon’tprotecttheearth.A.untilB.beforeC.thoughD.if[答案]D．[解析]if引导条件状语从句，表示“如果”。意思是如果我们不保护地球，我们将会没有水喝。直击中考Practice2、（2011重庆）Wewillplanttreestomorrow,andIdon’tknow

Tomwillcomeandjoinus.A.ifB.whichC.whatD.where[答案]A．[解析]if引导宾语从句，表示“是否”。意思是我们明天将会去植树，但是我不知道Tom会不会去。A直击中考Practice3.(2012贵州黔东南州中考)Wecan’tpastexam，

westudyhard.A.becauseB.andC.unlessD.yet[答案]C．[解析]句意“如果我们不努力学习，我们就不能通过考试”unless引导的条件状语从句，主将从现。C直击中考Practice4.(2011湖南益阳中考）Idon’tknowifshe

tomybirthdaypartytomorrow.Ifshe

,I’llbeveryhappy.A:comes,comesB:willcome,comesC:comes,willcome[答案]B．[解析]第一个if作“是否”讲时引导宾语从句，根据tomorrow判定要用一般将来时。第二个if引导的条件状语从句要用一般现在时态，因为主句用一般将来时态，从句中要用一般现在时态。B直击中考Practice5.(2010重庆江津中考)Ifhe