If引導(dǎo)條件狀語(yǔ)從句

GRAMMAR：:

2015.1.21位置：從句可放在主句之前或之后，但是放在主句之前須有逗號(hào)隔開(kāi)eg:如果我有足夠的錢，我就去環(huán)游世界定義：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(yǔ)，因此稱之為條件狀語(yǔ)從句。（If引導(dǎo)的條件狀語(yǔ)從句表示假如有從句的動(dòng)作發(fā)生，就會(huì)有主句動(dòng)作的發(fā)生）IfIhaveenoughmoney,Iwilltravelaroundtheworld=IwilltravelaroundtheworldifIhaveenoughmoneyIfitrainstomorrow,Iwillstayathome.一、什么是條件狀語(yǔ)從句？IfIgetuplate,Iwillbelateforschool.IfIdon’tfinishmyhomework,Iwon’tgotobed.Ifyoujointheband(樂(lè)隊(duì)),youwillbefamous.主從句的時(shí)態(tài)？If條件句：條件句用于陳述語(yǔ)氣，表示將來(lái)的可能性，能力，允諾，命令，要求，請(qǐng)求，建議時(shí)，假設(shè)的情況可能發(fā)生，其中if是“假如，如果”的意思。主句一般將來(lái)時(shí)

，從句用一般現(xiàn)在時(shí)。

構(gòu)成條件從句主句時(shí)態(tài)If＋一般現(xiàn)在時(shí)主語(yǔ)＋shall/will+動(dòng)詞原形例句Ifhecomes,hewilltakeustothezoo.運(yùn)用“主將從現(xiàn)”的原則。用法：1.

如果主句是一般將來(lái)時(shí)，從句則用一般現(xiàn)在時(shí)。

Ifitrains（從句），Iwillstayathome.I’llgowithyouifyoudon’twanttogoalone（從句）.2.如果主句含有must,may,can等情態(tài)動(dòng)詞，從句也要用一般現(xiàn)在時(shí)。

Ifyoudrivetoofast,youmayhaveanaccident.Youmuststopifthetrafficisred.Ifyoufinishthehomework，youcangohome．如果你作業(yè)做完了就可以回家了。

Ifyouwanttoloseweightyoumust/shouldeatlessbread.

如果你想減肥，你必須少吃面包。3.如果主句是祈使句，從句同樣要用一般現(xiàn)在時(shí)。Don’tgoandplayfootballifyoudon’tfinishyourhomework.PleasecallmeifhecomesnextSunday.練一練：1。如果她早點(diǎn)兒起床，就有時(shí)間在家里吃早餐Ifshe________alittleearlier,she’llhavetimetoeatbreakfastathome.2。如果你參加聚會(huì)，你將會(huì)過(guò)得很開(kāi)心。Ifyou____theparty,you_________agreattime.3。如果明天下雨，我們將不去野餐Ifit____tomorrow,we_______forapicnic.4。如果你經(jīng)常聽(tīng)英文歌，你將會(huì)喜歡英語(yǔ)Ifyouoften_______Englishsongs,you______English.getsupjoinwillhaverainswon’tgolistentowilllike1.Ifhe____________(not,do)it,I___________(do)it.2.Ifyou____(be)lateforschool,myteacher________(be)angry.arewillbe3.Ifshe________(win)theprize,we_______(be)happy.winswillbe4.IfI_________(not,eat)somuch,I_________(get)thinner.5.Ifyou______(tell)them,they_____________(not,believe)you.don’teatwillgettellwon’tbelievedoesn’tdowilldo用所給單詞的正確形式填空：6I_________(stay)athomeifit__________(rain).7.Ifit____________(not,rain),I_________(go)out.8.we__________(play)footballifitis_________(sun).9.Ifshe__________(become)astar,herparents____________(be)proudofher.

10.He_________(watch)TVifhe______(be)free.willstayrainsdoesn’trainwillgowillplaysunnybecomeswillbewillwatchis2.If從句（一般現(xiàn)在時(shí)），

主句（一般現(xiàn)在時(shí)）表示科學(xué)常識(shí)、事實(shí)、經(jīng)常性的動(dòng)作或傾向自動(dòng)會(huì)發(fā)生的事

1.Ifwaterisheated,itturnstosteam.2.Ifpeopledon’tgetenoughsleep,theirthinkingabilityisreduced.3.IfIneedahaircut,Iusually

gotothebarber’snearwhereIlive.4.Peopleoftendon’tgooutonSundaysifitrains.1.as(so)longas….“只要…，就…”表示一種前提條件You’llsucceedas(so)longas(ifonly)youtryhard.只要你努力，你就會(huì)成功。拓展：那么，除了if之外，是否還有其他連詞可以引導(dǎo)條件狀語(yǔ)從句呢

2．unless．除非；若不；如果不……；除非在……時(shí)候

1.Youwillfailtoarrivethereintimeunlessyoustartearlier．如果你不早點(diǎn)動(dòng)身，你就不能及時(shí)趕到那兒。

2.Unlessbadweatherstopsme，Igoforawalkeverymorning．除非天氣不好，我每天早晨都要去散步。3.Iwon‘tloanyouunlessyouareinextremeneedofmoney．若不是你急需用錢，我不會(huì)借錢給你的。

中考真題：（2011安徽）1.Iftherain_______(stop)tonight,wewillgotothecinema.（2012黑龍江）2.I’llbuyacomputerifI______(have)enougmoney.（2013內(nèi)蒙古）3.You_________(notget)nervousifyou_____(do)enoughexercise.（2014浙江）4.Ifshe____(be)kindtome,I__________(notargue)withher.stopshavewon’tgetdoiswon’targue

分析試題特點(diǎn)及做題思路：1.考連詞---做題思路：分析句子---判斷關(guān)系---選擇正確的連詞：1.Youwon’tgetnervous_____youdoenoughexercise.A.if,B,unlessC,whether2._______youhurryup,youwillmisstheearlybus.A.if,B,unlessC,whether分析試題特點(diǎn)及做題思路：

2.You

may______(pass)

the

exam

if

you

___(study)

hard.

2.考時(shí)態(tài)---做題思路：認(rèn)字--判斷語(yǔ)境提供的時(shí)態(tài)特點(diǎn)--選擇正確的時(shí)態(tài)A.rain,stayB.rains,

stayC.rains,willstayD.rain,will

stay

1.IfIt______(rain)tomorrow,I______(stay)athome.A.pass,studyB.willpass,studyC.pass,willstudyD.passes,studyIfI’mill,__________________.

IwillseeadoctorLookandsayIfI’mlate,_________________.Iwillsaysorry條件狀語(yǔ)從句在日常生中的應(yīng)用：IfI’mhungry,Iwill______________.IfI’m

tired,Iwill_____________.Lookandsayeatsomefoodhavearest

Ifitrainstomorrow,I_____________________.willwatchTVathomeIfit_____________tomorrow,________________.I’llplaybasketballdoesn’tr