条件状语从句教学课件

RevisionAdverbialClauseofCondition条件状语从句一、什么是条件状语从句？

在某种条件下，可能发生某事。而由if/unless引导的表示条件的句子，就叫条件状语从句。eg:Ifyougetupearly,youwillcatchthebus.Ifyouputwoodintowater,itfloats.Ifyouarehappy,whatwillyoudo?

IfIamhappy,Iwillsmile.Ifyoubecomesad,whatwillyoudo?IfIbecomesad,Iwillcry.Sheisdoingherhomework.Ifyouarehard-working,youwillgetgoodgrades.Shegetsgoodgrades.Ifyouplaycomputergamesonweekdays

,you’llbeverytiredinclassyourparentswillbesad.youwon’tgetgoodgrades.youreyeswillbepoorShewillbelate.Ifshe_____toschool,she________late.Sheisgoingtowalktoschool.walkswillbeLead-inIfyouhaveenoughpocketmoney,whatwillyoubuy?IfIhaveenoughpocketmoney,I____________________.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条件句：条件句用于陈述语气，表示假设的情况可能发生，其中if是“如果”的意思。

主句一般将来时

，从句用一般现在时。

构成条件从句主句时态If＋一般现在时主语＋shall/will+动词原形例句Ifhecomes,hewilltakeustothezoo.二、时态1．当主句和从句所表示的是原理、客观真理、规则时，主句是一般现在时（包括祈使句和含有情态动词can/may/must等），从句也要用一般现在时。例如：1)Ifyouputapieceofpaperintowater,itgetswet．如果你把一张纸放进水中，它会变湿。(原理)

2)Becarefulifyoucrosstheroad.(祈使句)

3)Youmustseethedoctorifyouareill.(含有情态动词）3.如果从句用现在进行时或现在完成时，主句需用一般将来时。1）IfyouarelookingforPeteryou’llfindhimupstairs.如果你是在找彼得，上楼就会找到他。2）IfyouhavefinisheddinnerI’llaskthewaiterforthebill.如果你吃完了，我就叫服务生来算账。

1.

如果主句是一般将来时，从句则用一般现在时。

Ifitrains（从句），Iwillstayathome.I’llgowithyouifyoudon’twanttogoalone（从句）.2.如果主句含有must,may,can等情态动词，从句也要用一般现在时。

Ifyoudrivetoofast,youmayhaveanaccident.Youmuststopifthetrafficisred.3.如果主句是祈使句，从句同样要用一般现在时。

Don’tgoandplayfootballifyoudon’tfinishyourhomework.

PleasecallmeifhecomesnextSunday.if条件状语从句结构及时态Revision1.Ifhe____________(not,doit),I___________(do)it.2.Ifyou____(be)lateforschool,myteacher________(be)angry.arewillbe3Ifshe________(win)theprize,we_______(be)happy.winswillbe4.IfI_________(not,eat)somuch,I_________(get)thinner.5.Ifyou______(tell)them,they_____________(not,believe)you.don’teatwillgettellwon’tbelieve6I_________(stay)athome,Ifit__________(rain).7.Ifit____________(not,rain),I_________(go)out.8.we__________(play)football,Ifitis_________(sun).9.Ifshe__________(become)astar,herparents____________(not,send)heraway

10.He_________(watch)TV,ifhe______(be)free.willstayrainsdoesn’trainwillgowillplaysunnybecomeswon’tsendwillwatchisdoesn’tdowilldo

2.You

may______(pass)

the

exam

if

you

___(study)

hard.

rainswillstaypassstudy

3.Ifyouwanttorecord,________(press)theredlight.press1.IfIt______(rain)tomorrow,I______(stay)athome.Fillintheblanketswiththeproperform

1.I’msureifhe_____(go)totheparty,he________(have)agreattime.2.Iftherain_______(stop)tonight,wewillgotothecinema.3.I’llbuyacomputerifI______(have)enoughmoney.4.You_________(notget)nervousifyou_____(do)enoughexercise.6.Iwanttoknowifhe_________(come)tomorrow,ifhe_______(come),I__________(give)themassagetohim.goeswillhavestopshavewon’tgetdocomeswillcomewillgive四、转换

1、当主语是you时,if引导的条件状语从句可与“祈使句+and／or+简单句”进行句型转换。and表示句意顺承；or表示转折，意为“否则”。例如：Takecare,oryou'llfalloffthetree.小心，否则你会从树上掉下来。=Ifyoudon'ttakecare,you'llfalloffthetree.

2.unless也可引导条件状语从句，相当于if...not，意思是“如果不、除非”。例如：YouwillfailinMathunlessyouworkharder.=YouwillfailinMathifyoudon'tworkharder.你要是不再加把劲儿，数学考试就不及格了。Ifyouarefreethisweekend,whatwillyoudo?IfIamfree,…sleepwatchTVplaycomputergamespracticeIfyouwanttogetgoodmarks,

dowhat?Don’tdowhat?Ifyouwanttogetgoodmarks,__________.Ifyouwanttogetgoodmarks,don’t__________.studyhardlistentoteacherscarefully.dohomeworkbyyourself.

copyyourhomework.talkintheclasscheatintheexamsGameRulesTopic1:IfIamhappy,……A:IfIamhappy,Iwillgoshopping.B:IfIgoshopping,Icanbuysomeclothes.C:IfIcanbuysomeclothes,Iwillspendmuchmoney.D:IfIspendmuchmoney,……E:…..【比一比】：一分钟内，根据所给话题，看同学们能接出多少条件状语从句。【注意】在句子接龙时，主句与从句变换时，要注意从句时态的变换，从句用一般现在时。If条件句的替代形式：

（1）祈使句+and/or+陈述句（谓语动词通常用将来时态）。其中，and表示句意顺承；or表示转折，意为“否则”。e.g.Ifyouworkhard,you’llpasstheexameasily.=Workhard,andyou’llpasstheexameasily.Ifyoudon’tworkhard,you’llfallbehindothers.=Workhard,oryou’llfallbehindothers.verygoodActivity1Rewritethesentenceswithif:Listeninclass,oryouwon’tunderstandwhattodo.Ifyoudon’t

listeninclass,youwon’tunderstandwhattodo.1)Eatbreakfast,oryou’llgethungryatschool.2)Hurryup!We’llbelate!Ifyoudon’teatbreakfast,you’llgethungryatschool.Ifyoudon’thurryup,we’llbelate.If在宾语从句中翻译为“是否”If在条件状语从句中翻译为“如果”I’llgotoseeyouifIamfreenextweek.Iwanttoknowifheisateacher.whether1.if在句中的含义不同1.Canyoutellmeifshecancometothemeeting?2.Shewillnotgothereifitisrainytomorrow.3.Ican’tguessifshewillbeangry.4.Ifwehelpeachother,wewillgetgoodresults.1

IfI_______________(notunderstand）,Iwillaskmyteacherforhelp.IfI__________(copy)yourhomework,Iwillcheatmyself.3Ifshe_______________(notget)upearly,she’llmisstheearlybus.4Ifyourmother_______(buy)thebookforyou,itwillbegoodforyourstudy.

don’tunderstand

copy

doesn’tget

buys5.Ifyou____________(notwork)hard,you_________(notpass)theexam.6.Ifyourbrother____________(break)thewindow,hewillfeelverysorryforthat.7.Ifthecomputer

(notwork),menditplease.don’tworkwon’tpassbreaksdoesn’twork8.Ifshe_______(notbe)interestedinmath,shewillfinditveryboring.9.Ifyou_________(get)highscores,yourparentswillbeproudofyou.10.Ifyou_________(be)happy,wewillbehappy.isn’tgetare

.Iwanttoknowifhe_______(come)tomorrow,ifhe_______(come),I__________(give)themessagetohim.

comeswillcomewillgivesummaryif的用法2.引导条件状语从句：译为“如果，假如”(1)if从句+祈使句(2)if从句+主句（一般将来时）(3)if从句+主句（含有情态动词）

1.引导宾语从句：译为“是否”，表示不确定的概念。Idon’tknowifyourfathercancometogether.Canyoutellmeifmissyourparents?1.Ifyou_____totheparty,you’llhaveagreattime.A.willgo

B.went

C.go

D.going2．I____hertheanswerifshe____me.A.cantell,willask

B.willtell,willask

C.wouldtell,