if引导条件状语从句的用法

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1、◆if引导的条件状语从句　　条件状语从句是在复合句中作条件状语的句子。表示假如有从句的动作发生就会有主句的动作发生。条件状语从句常由从属连词if引导。　　◆if引导的条件状语从句使用须知：　　一、位置　　if引导的条件状语从句，既可放在主句之前也可放在主句之后。当从句置于主句之前时，常用逗号与主句隔开。例如：　　Youwillcatchthebusifyougetupearly.　　=Ifyougetupearly,youwillcatchthebus.　　如果你早起的话，就能赶上公共汽车。　　二、时态　　应遵循主、从句时态呼应的原则。当主句是一般现在时(包含祈使句和含情

2、态动词can,may,must等的句子)，从句也用一般现在时。例如：　　Youmustseethedoctorifyouareill.　　如果你生病了，你必须去看医生。　　Ifyouwanttogoskating,wearwarm　　clothes.如果你想去滑冰，穿上暖和点的衣服。一．选择正确答案。 1.Itwasrainingheavily___ wegottoParis.A.while           B.if        C.when          D.because2.Idon’tknowif___  tomorrow. A.itdoesn’train

3、                B.therainwillstops C.therainswon’tstop           D.itwon’train3.Thevolleyballmatchwillbeputoffifit___         .A.willrain      B.rains       C.rained  D.israining4.Difficultiesarenothingifwe___   notafraidofthemA.will     B.shall         C.are      D.do5.We___ Beijingtomor

4、rowifitdoesn’train.A.aregoingto    B.would   C.shall    D.willgo6.Idon’tliketobeinterruptedifI___  . A.speak     B.willspeak     C.amspeaking   D.spoke7.Ifyou___  thebookyouwillunderstandthestorybetter.A.willbereading   B.haveread    C.willhaveread   D.read8.Ifyou___  IwillgowithyouA.goto

5、        B.went        C.will     D.shouldgo9.I’llgotomeetyou，ifI___   freethen.  A.wouldbe     B.willbe    C.am        D.was10.Ifyou___  tothemusic,buyaCD.A.willlisten    B.listen      C.listening   D.listened11.Hesuggested___  apinictomorrow.A.tohave      B.having     C.have    D.tohavin

6、g12.Becareful,ifyou___   wanttomakemistakes.  A.won’t       B.don’t      C.didn’t      D.not13.Workhardifyou ___    togetagoodmark.A. wanted      B.wanting    C.want       D.willwant14.Iwanttoknowifyou___   tothepartytomorrow.  IwillifI___ free.A.willcome;am              B.come;amC.willco

7、me;willbe           D.come;willbe15.Thecat___    him___  thehand.A. bit;in       B.bited;on    C.bit;on     D.bited;on16.Thereisgoingto ___   asportsmeetingnextweek.Ifit ___ ,we’llhavetocancelit..A.be;willrain                 B.have;willrainC.be;rains