条件状语从句

在句子中做条件状语的从句称为条件状语从句。可置于句首、句尾，有时还可置于主语和谓语之间。引导条件状语从句的连接词有：if,unless,as/solongas等1.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。Ifwepaymuchattentiontotheearth,we'llhaveabetterworld.如果我们多关爱地球，就会拥有一个更美好的世界Ifitrainstomorrow,whatshallwedo?如果明天下雨，我们怎么办？注意：if还可以引导虚拟条件句，表示不可实现的条件，从句中多用一般过去时或过去完成时。Whatwouldhappeniftherewerenowater?如果没有水会怎样？2.unless引导的条件状语从句unless的意思是如果不，除非。可与if...not互换。YouwillfailinEnglishunlessyouworkhard.你英语考试会不及格的，除非你更加努力。3.as/solongas引导的条件状语从句as/solongas意思是“只要”Solongasyou'rehappy,iwillbehappy.只要你高兴，我就高兴。4.once引导的条件状语从句once引导的条件状语从句，意为“一旦...，就”，从句可置于主句前或后Onceyoubegin,neverstop.一旦开始，就绝不要停止Mathsiseasytolearnonceyouunderstandtherules.一旦你理解了规则，数学就不难学了。提示：在条件状语从句中，用一般现在时代替一般将来时，用一般过去时代替过去将来时。Iftheweatherisbadnextweek,we'llputofftheclimbing.如果下周天气不好，我们将推迟爬山。Fathertoldmeifiworkedhardhewouldbuymeagift.爸爸告诉我，如果我努力学习，他会给我买一份礼物。Iftheweatherisbadnextweek,we'llputofftheclimbing.I.选择最佳答案.()1.Ifit______sunnytomorrow,I____boating.a.isgob.willbe,goc.is,willgod.willbe,willgo()2.----whatwillyoudoifit______tomorrow,----I’llstayathomeandwatchTV.a.rainb.rainsc.willraind.israining3Runfast,oryou’llbelateforschool._______you______________fast,you’llbelateforschool.4.Youcanbuythedictionaryifyoutakeenoughmoneywithyou.Takeenoughmoneywithyou,_________________buythedictionary.5Ifthereisnoair,noneofuscanlive.Noneofuscanlive________________.6.如果明天有空，我和你一起参观长城。_______________________________________________7如果我们骑自行车去上班，我们可以避免空气污染。______________________________________________8如果明天他不来,我会代替他去的。_______________________________________________9.Idon'tknowwheatherhe_______(come)tomorrow.Ifhe______(come),I'lltellyou．10Wewillgototheparkunlessit_______(rain)11Ifhe___inhalfanhour,we___waitforhim.A.won'tcome,won'tB.won'tcome,don'tC.doesn'tcome,won'tD.willcome,don't12如果他考试不及格,他的母亲会难过的.Hismother____________ifhe____passtheexam.13如果他明天起床不够早的话,就不能赶上早班车Ifhe___getupearly___,he___beabletocatchtheearlybus.141.Ifyou_____totheparty,you’llhaveagreattime.A.willgoB.wentC.goD.going15.Itwillbealongtime____Peter_____hiswork.A.since,hasfinishedB.after,finishesC.when,willfinishD.before,finishes.16Whatwillfather_____usfromJapan?A.takeB.bringC.carryD.make17.Weifangisfamous______kites.A.forB.toC.onD.with18．I____hertheanswerifshe____me.A.cantell,willaskB.willtell,willaskC.wouldtell,askD.willtell,asks19–Whatareyougoingtodotomorrow?--We’llgotothelibrarytomorrowifit____.A.isn’trainB.rainC.won’trainD.doesn’train20.—Doyouknowwhenhewillcomebacktomorrow?--Sorry,Idon’tknow.Whenhe____back,I’lltellyou.A.comesB.willcomeC.comeD.maycome21.Whatwillyoudoifyou_____totheoldfolk’shomevisit?A.goB.wentC.goingD.willgo22.IfIeat____food,I’llbeveryfat.A.toomanyB.manytooC.toomuchD.muchtoo23.I’llgivethebooktohimifhe___herenextSunday.A.willcomeB.comesC.iscomingD.came24.There____anEnglishfilminourschooltomorrow.A.isgoingtohaveB.willhaveC.isgoingtobeD.has24.Couldyoutelluswhere____？A.willthenextOlympicGamesheldB.thenextOlympicGameswillbeheldC.wouldthenextOlympicGamesbeheldD.thenextOlympicGameswouldbeheld25.Whenmymotherreturnedlastnight,I____abook.A.readB.amreadingC.wasreadingD.amgoingtoread26.What____you____whenitbegantorain?A.do,doB.were,doingC.are,doingD.did,do27.I’llwakeyouupwhenhe____back.A.willB.isgoingtocomeC.comesD.come