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1、Adverbialclauseofcondition条件状语从句Ifyoufailintheexam,youwilllethimdown.如果你考试不及格,你会让他失望的我可以告诉你真相,条件是你答应保守秘密。Icantellyouthetruthonconditionthatyoupromisetokeepasecret.Youwillfailtoarrivethereintimeunlessyoustartearlier.Supposing/supposeitrains,shallwecontinuethesportsmeeting?Hewon’tbeagainstusinth
2、emeetingprovided/providingthatweaskforhisadviceinadvance.Incaseitrains,Iwilltakeanumbrella.Aslongasyoupromisetocome,I’llwaitforyouuntilyoucome.状语从句中的省略：当从句主语和主句主语一致或者为It，从句谓语动词含有be动词，这是可以省略主语和be动词。If(itis)necessary,Iwillsellthecar.when(youare)driving,youshouldbecareful.justdoas(youare)toldto.1
3、.whenfirst____tothemarket,theseproductsenjoyedsuccess.A.introducingB.introduceC.introducedD.beingintroduced2.unless____tospeak,youshouldremainsilentatthemeeting.A.invitedB.invitingC.beinginvitedD.havinginvitedIfIwereyou,Iwouldinvitehimtotheparty.如果我是你,我会邀请他参加聚会。IwouldhavearrivedmuchearlierifIh
4、adnotbeencaughtinthetraffic.如果没有堵车,我会到的早一点儿。另外,if从句还表示不可实现的条件或根本不可能存在的条件,也就是一种虚拟的条件或假设,2.Ifyou_______thisexperiment,youwillunderstandthetheorybetter. A.willbedoingB.havedoneC.willhavedoneD.woulddoB3.Thevolleyballmatchwillbeputoffifit________. A.willrain B.rainsC.rained D.i
5、srainingB4.—ShallBrowncomeandplaycomputergames? —No,________hehasfinishedhishomework. A.when B.if C.unless D.onceC1.—AreyouthinkingaboutgoingtoNewYorkfortheholiday? —No.ButifI________thetime,Iwoulddefinitelygo. A.have B.hadC.havehad D.wouldhaveBII.Choosethebestanswers.Adve
6、rbialclauseofconcession让步状语从句1.though,although表示“虽然,纵然”之意。在一般情况下可以互换使用。在口语中,though较常使用,although比though正式,二者都可与yet,still或nevertheless连用,但不能与but连用。让步状语从句的引导词:e.g.Though/Althoughhewaswornout,(still)hekeptonworking.虽然他已经精疲力竭,但仍然继续工作。Though/Althoughheisveryold,(yet)heisquitestrong.他虽然年纪大了,身体还很健壮。Th
7、oughhewasachild,heknewwhattodo.虽然他是一个孩子,但他知道该做什么=Childas/thoughhewas,heknewwhatwastherightthingtodo.2.as,though表示“虽然……但是”,“纵使……”之意。as引导的让步状语从句必须以部分倒装的形式出现,被倒装的部分可以是表语（adj./n.）、状语(adv)或动词原形,though间或也用于这样的结构中,但although不可以这样用。Objectas/thou
