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一、时态如果主句是一般将来时态，这时从句不可以用将来时态，而要用一般现在时。例如：Iwon’tgotherewithyouifitrainstomorrow.如果明天下雨的话，我就不和你一起去那儿了。二、主从句的位置大多数情况下，从句可以位于主句之前，也可以位于主句之后。不过从句在前时，主从句之间必须用逗号隔开。例如：Pleasetellmeifhecomesback.=Ifhecomesback,pleasetellme.如果他回来了，请告诉我一声。三、if的两面性if引导条件状语从句时意为“如果”，如果引导宾语从句则意为“是否”。请比较：1)Wewillgooutifitisfinetomorrow.2)Idon’tknowifthetrainhasarrived.句1)中if引导的是状语从句。这个从句表示“条件”，整个句子的意思是“如果明天天气好，我们就出去”。句2)中if引导的是宾语从句，充当谓语动词don’tknow的宾语，整个句子的意思是“我不知道火车是否到了”。1.Ifit______sunnytomorrow,I____boating.A.isgoB.willbe,goC.is,willgoD.willbe,willgo2.----Whatwillyoudoifit______tomorrow,----I’llstayathomeandwatchTV.A.rainB.rainsC.willrainD.israining1.Runfast,oryou’llbelateforschool._____you___________fast,you’llbelateforschool.2.Youcanbuythedictionaryifyoutakeenoughmoneywithyou.Takeenoughmoneywithyou,_________________buythedictionary.3.Ifthereisnoair,noneofuscanlive.Noneofuscanlive________________.Ifdon’trunandyoucanwithoutairif条件状语从句的时态练习1.Diana(willgo/go/goes)toEuropeifshe(willpass/pass/passes)theexams.2.Thegraduates(willteach/teach/teaches)inthepoorvillageiftheteacher(willagree/agree/agrees)soon.3.Ifthere(willbe/are/is)acaraccident,they(willcall/call/calls)110forhelpatonce.4.Ifit(won’t/don’t/doesn’t/isn’t)rainy,we(willtake/take/takes)walkoutside.5.IfaUFO(willland/land/lands)infrontofme,I(willgo/go/goes)intolookforthealien.willgopasseswillteachagreeswillgolandswilltakeisn’twillcallis6.Ifhe(willhave/have/has)money,he(willbuild/build/builds)asciencelab.7.Don’twaitformeifI(am/willbe)late.8.They(won’t/don’t)gotothebeachifit(willrain/rain/rains).9.I(willcall/call)youifhe(willstay/stay/stays)athome.10.Mr.Smith(willlet/let/lets)youknowifhe(willneed/need/needs)help.11.(Will/Do/Does)hevisitthemuseumifhe(won’t/don’t/doesn’t)gettired?12.Where(will/do/does)theyliveifthey(willmiss/miss/misses)thebus?rainsmisseswilldoesn’tWillneedswillletstayswillcallwon’tamwillbuildhas1.Ifyou_____totheparty,you’llhaveagreattime.A.willgoB.wentC.goD.going2.Itwillbealongtime____Peter_____hiswork.A.since,hasfinishedB.after,finishesC.when,willfinishD.before,finishes.3.Whatwillfather_____usfromJapan?A.takeB.bringC.carryD.make4.Weifangisfamous______kites.A.forB.toC.onD.with5.I____hertheanswerifshe____me.A.cantell,willaskB.willtell,willaskC.wouldtell,askD.willtell,asks6.–Whatareyougoingtodotomorrow?--We’llgotothelibrarytomorrowifit___.A.isn’trainB.rainC.won’trainD.doesn’train7.—Doyouknowwhenhewillcomebacktomorrow?--Sorry,Idon’tknow.Whenhe____back,I’lltellyou.A.comesB.willcomeC.comeD.maycome8.Whatwillyoudoifyou____totheoldfolk’shomevisit?A.goB.wentC.goingD.willgo9.IfIeat____food,I’llbeveryfat.A.toomanyB.manytooC.toomuchD.muchtoo10.I’llgivethebooktohimifhe___herenextSunday.A.willcomeB.comesC.iscomingD.came11.There____anEnglishfilminourschooltomorrow.A.isgoingtohaveB.willhaveC.isgoingtobeD.has12.Couldyoutelluswhere____？A.willthenextOlympicGamesheldB.thenextOlympicGameswillbeheldC.wouldthenextOlympicGamesbeheldD.thenextOlympicGameswouldbeheld13.Whenmymotherreturnedlastnight,I____abook.A.readB.amreadingC.wasreadingD.amgoingtoread14.What____you____whenitbegantorain?A.do,doB.were,doingC.are,doingD.did,do15.I’llwakeyouupwhenhe____back.A.willB.isgoingtocomeC.comesD.come1.Ifyou________(feel)tired,you_______________(have)tohavearest.2.Where_______he_________(see)thefilmifhe________________(have)time?3.Ifthere__________(be)fewertrees,there_______________(be)morepollution.4.He_____________(dress)morecasuallyifhe________________(notwork)onweekends.5.IfMarcia_____________(live)alone,she___________________(keep)apetparrot.6.Lana________________(buy)anewdressiftheoldone____________(be)outofstyle.feelcanhavecanseehasarewillbewilldressdoesn’tworklivesshould/willkeepcan/willbuyis