條件狀語從句一、條件狀語從句的概念條件狀語從句，即在某種條件下，一件事情可能發(fā)生。在英語中由連接詞if或unless等引導(dǎo)的狀語從句叫做條件狀語從句。條件是指某一件事情實(shí)現(xiàn)之后（狀語從句中），一件事情（主句）才能發(fā)生，通常譯作“假如，只要，如果”等意思。條件狀語從句中，主從句的時(shí)態(tài)要遵循“主將從現(xiàn)”的原則。即，主句是將來時(shí)態(tài)時(shí)，從句用一般現(xiàn)在時(shí)代替將來時(shí)態(tài)。二、條件狀語從句的引導(dǎo)詞if,unless=ifnot,as/solongas,once,asfarasEg.Ifyoufailintheexam，youwilllethimdown．Youwillfailtoarrivethereintimeunlessyoustartearlier.Youmayborrowmybookaslongasyoukeepitclean.三．關(guān)于條件句的時(shí)態(tài)，常見的有以下三種情況：

1、條件狀語從句的主句是一般將來時(shí)，那么從句常常用一般現(xiàn)在時(shí)。即主將從現(xiàn)Ifit____________(not,rain),I_________(go)out.doesn’trainwillgo2、如果主句是祈使句，那么從句通常要用一般現(xiàn)在時(shí)。Pleasecallmeifhe___________(come)nextSundaycomes3、如果主句是含有情態(tài)動(dòng)詞時(shí)，根據(jù)需要從句多用一般現(xiàn)在時(shí)。You

may______(pass)

the

exam

if

you

________(study)

hard.

passstudy4.

If條件句的同義句：祈使句，and/or+將來時(shí)態(tài)的陳述句。Workhard,andyouwillmakegreatprogress.=Ifyouworkhard,youwillmakegreatprogress.If在賓語從句中翻譯為“是否”If在條件狀語從句中翻譯為“如果”I’llgotoseeyouifIamfreenextweek.Iwanttoknowifheisateacher.whether1.if在句中的含義不同2.if在從句中的位置不同If引導(dǎo)的賓語從句放在主句之后；而if引導(dǎo)的狀語從句可放在主句之前也可放在主句之后=Ifitdoesn’train,Iwillgoouttomorrow.Iwillgoouttomorrowifitdoesn’train.Idon’tknowifthetrainhasarrived.

If引導(dǎo)的條件狀語從句放于句首時(shí)多用逗號(hào)隔開；而if引導(dǎo)的賓語從句則不能。3.時(shí)態(tài)要求上有區(qū)別If引導(dǎo)條件狀語從句的時(shí)態(tài)為一般現(xiàn)在時(shí)記住“主將從現(xiàn)”

1.Iwanttoknowifthere

asportsmeetingnextmonth.doesn’trainwillbe2.Ifit

doesn’train,we’llgooutIf引導(dǎo)的賓語從句的時(shí)態(tài)由主句及本身時(shí)態(tài)決定；1

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

don’tunderstand

copy

doesn’tget

buys

3.---Doyouknowifhe_______toplaybasketballwithus?

---Ithinkhewillcomeifhe______freetomorrow.【2017江蘇無錫】A.comes;is

B.comes;willbeC.willcome;is

D.willcome;willbe1.(2017西寧）Ifit______sunnytomorrow,Iwillgoshoppingwithmy

friendinthesupermarket.

A.willbeB.beC.isD.was4.（2017寧夏）Wewillhaveapicnicinthecountryside____

itdoesn’train.

A.unlessB.althoughC.untilD.if2.（2017湖北黃岡）—Doyouthinkweshouldshareourproblems

withourparents?

—Sure!______wetalktothem,we’llfeelworse.

A.IfB.AlthoughC.BecauseD.Unless5.（2016湖北宜昌）—Learningtoloveislikelearningtowalk.

—Yes,______westepoutbravely,we’llfindit’snotsodifficult.A.asifB.eventhoughC.aslongasD.asfarasCDC