初中英语条件状语从句语法点和习题(含答案)

语法点拨：if与unless引导的条件状语从句1．常用引导词：if（如果），unless（除非）。Iwon’tgotothemoviesunlessIamfreetomorrow.除非我明天有空，否则我不会去看电影。2．条件状语从句的位置可放在句首或句尾，放在句首时常用逗号与主句隔开。e.g.Ifitrainstomorrow,Iwillstayathome.=Iwillstayathomeifitrainstomorrow.如果明天下雨我就呆在家里。3．if引导词用法if引导的条件句有：真实条件句和非真实条件句两种。真实条件句：表示在某种条件下某事很可能发生。e.g.Ifyouaskhim,hewillhelpyou.如果你请他帮忙，他会帮你的。4．unless引导词用法固定搭配：unless=if...not除非，若不，如果不e.g.Youwillfailtoarrivethereintimeunlessyoustartearlier.=Ifyoudon’tstartearlier,youwillfailtoarrivethereintime.如果你不早点动身，你就不能及时赶到那儿。注意：在含有条件状语从句的复合句中，当主句是一般将来时态，从句要用一般现在时（即主将从现原则）。如果主句是祈使句或含有情态动词时，从句也用一般现在时表将来。e.g.Ifyoustudyhard,youwillpasstheexam.1.Iwillsendyouane-mailassoonasI____A___inCanada.A.arriveB.arrivedC.amarrivingD.willarrive2.Ifthere____A___nobuyingandsellingofanimals,there______nokillinginnature.A.is;willbeB.willbe;willbeC.is;isD.willbe;is3.I’mwaitingformyfriend.__C___,I'llgoshoppingalone.A.IfshecomesB.Ifshewon'tcomeC.Ifshedoesn'tcome5.Youcan’twatchTV___A_____youfinishyourhomework.A.unlessB.ifC.whileD.as7.Thestudents_____A___haveasportsmeetingthisweekendifit___.A.won’t;rainsB.will;rainsC.won’t;willrainD.aregoingto;isgoingtorain9.Idon'tknowifshe____B___tomybirthdaypartytomorrow.Ifshe______,I'llbeveryhappy.A.comes;comesB.willcome;comesC.comes;willcome10.—WhenwillyoucometoDaqing?—Iwillcallyou___D__Iarrive.A.tillB.whileC.asquicklyasD.assoonas11.I’llgiveittoJimassoonasI___C____himtomorrow.A.sawB.willseeC.seeD.haveseen