2018中考英语语法专题 条件状语从句讲解+练习 3页

条件状语从句常用引导词：if,unless,as/solongas1、if从句+祈使句，“如果……，就……”Ifyoudonotfeelwell,pleasegotoseethedoctor.如果你感觉不舒服，就去看医生吧。Ifyouwanttoknowmoreaboutit,callnow.如果你想了解更多内容，现在就打电话吧。MakesureyouvisittheScienceMuseumifyouevergotoLondon.如果你去伦敦，一定要去参观科学博物馆。2、主将从现IfIstartafterdinner,I’llfinishitbeforeIgotobed.如果我晚饭后开始，睡觉前我就能完成。主句也可用“情态动词+动词原形”Shemaycomewithusifshearrivesintime.如果她来得及时，就可以和我们一起去。3、if条件状语从句和并列句的转换Hurryup,oryou’llbelate.=Ifyoudon’thurryup,you’llbelate.Studyhardandyouwillpasstheexam.=Ifyoustudyhard,youwillpasstheexam.练习（一）句型转换1.Runfast,oryou’llbelateforschool._______you______________fast,you’llbelateforschool.2.Youcanbuythedictionaryifyoutakeenoughmoneywithyou.Takeenoughmoneywithyou,_____________________buythedictionary.3.Ifthereisnoair,noneofuscanlive.Noneofuscanlive______________.4、unless“除非”Don’tleavethebuildingunlessItellyouto.不要离开大楼，除非我准许。Unlessyouhavefinishedyourhomework,Iwon’tallowyoutowatchTV.除非你已完成了作业，否则我是不会让你看电视的。unless=ifnotYou’llbelateifyoudon’thurry.=You’llbelateunlessyouhurry.Ican’tcatchthetrainifIdon’tgetupearly.=Ican’tcatchthetrainunless Igetupearly.练习（一）ifnot与unless相互替换1.HewillnotgounlessIcomewithher._____________________________________________2.Ifyoudon’tfinishit,Iwillbeangry._____________________________________________3.UnlessIammistaken,I’veseenthatmanbefore._____________________________________________4.Youwon’tgetagoodjob,unlessyouworkhard._____________________________________________5.Unlessthestrikehasbeencalledoff,therewillbenotrainstomorrow.__________________________________________________________5、as/solongas只要Youmayusemydictionaryas/solongasyoudon’tkeepittoolong.只要使用时间不太长，你可以用我的词典。Youcantakemycaras/solongasyoudrivecarefully.你可以用我的汽车，只要你小心点儿开。练习（一）用if或unless填空1.________hewantstoseeme,youcantellhimtowait.2.________itsnowstomorrow,we’llhaveadayortwooff.3.Wewon’tgotohisparty________heinvitesus.4.Sheissuretopasstheexamination________sheisill.5.I’lltakethatcomputer________Ihaveenoughmoney.6.________mygrandmawearsglasses,shecanseebetter.7.Iwon’tbuythatbackpack________itcostslessthan$208.________I’mtired;I’llhavearestfortea.9.Youwon’tgetpaidfortimeoff________youhaveadoctor’snote.10.Youwillgetatoothache________youdocleanyourteethregularly.（二）用所给单词的适当形式填空1.Ifhe________(get)alowmarkinthetest,he________(study)harder.2.Ifyou________(swim)everydaythissummer,you________(be)veryhealthy.3.Ifhe________(nothurry),he________(notsee)thebeginningofthematch.4.Youcan’tgooutunlessyou________(finish)yourhomework.5.UnlessIsavemymoneycarefully,I________(notbe)abletobuyafootball.6.Ifit________(notrain)tomorrow,we________(go)tothepark. 7.Ifhe________(return)totheschool,I________(let)youknow.8.He________smokeunlesshe________(have)enoughmoney.9.Theycanrememberitbetterifsomeone________(give)themsomeadviceaboutit.10.Theman________(setoff)ifhe________(buy)theairticket.（三）单项填空1.IfI_____hisphonenumber,Iwilltellyou.A.findB.foundC.willfindD.havefound2.Wewillgocampingifit_____tomorrow.A.Won’trainB.didn’trainC.doesn’trainD.isn’training3.I’mwaitingformyfriend.Ifhe_____,I_____swimmingalone.A.doesn’tcome;willgoB.won’tcome;willgoC.willcome;won’tgoD.don’tcome;willgo4._____yougotothesupermarketat7p.m.,youcanbuyalotofcheapfood.A.IfB.UnlessC.WhetherD.When5.Iwon’tgettothepartyontime_____Icatchthefirsttraintomorrowmorning.A.IfB.UnlessC.WhetherD.When6.—Shallwegoonapicnicthisweekend?—Goodidea!Unlessit_____.A.rainsB.doesn’trainC.rainD.won’train7.—CanIchangethejacketforanotherone_____itdoesn’tfitmewell?—Ofcourse.A.unlessB.ifC.thatD.though8.Nobodycanlearnmathswell_____heworkshardonit.AifBunlessCthoughtDhowever9.Iffish_____awayfromwater,they_____die.Aaretaking,won’tBaretaken,willCarebeingtaken,willDtake,won’t10.Eachstudentcanaskteachersforhelpifhe_____howtoworkouttheproblem.AwillknowBwon’tknowCdon’tknowDdoesn’tknow