资源描述：
《让步状语和条件状语从句.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、Module3BodyLanguageandNon-VerbalCommunicationGrammarGrammar1条件状语从句常用引导词有if，unless(除非，如果不，除非在…的时候),incase(如果，以防),onconditionthat(在…条件下,如果),aslongas(只要)，provided(that)/providing(that)(假如,在…条件下),suppose(that)/supposing(that)(如果,假如)，when(倘若)等连词引导。注意：条件状语从句中用一般现在时 代替一般将来。3.Shewillgoprovidedherfriends
2、cangoalso.4.Hewilldotheworkprovidingyoupayhim.5.Aslongasyou’rehappy,itdoesn’tmatter whatyoudo.6.IncaseIforget,pleaseremindmeaboutit.7.Supposingitrains,shallwecontinuethe sportsmeeting?8.Icantellyouthetruthonconditionthatyoupromisetokeepasecret.1.Ifitrainstomorrow,Iwillnotgoswimming.2.Youwillfail
3、unlessyouworkhard.9.Callmewhenyouhavefinished.说明unless从句的谓语只能用肯定式。unless和if…not同义，unless是书面语，if…not是口语，通常二者可以换用。条件状语从句中的谓语动词的时态一般要用现在时或过去时代替一般将来时或过去将来时。If引导的虚拟条件句与现在事实相反，从句中用一般过去时(be用were)，主句用woulddoIfIwereyou,Iwouldhelphim.Ifhehadenoughmoney,hewouldbuythatbook.与过去事实相反，从句中用过去完成时时，主句用wouldhavedon
4、e.IwouldhavearrivedmuchearlierifIhadnotbeencaughtinthetraffic.如果没有堵车,我会到的早一点儿。与将来事实相反，从句中用①一般过去时(be用were)②shoulddo③weretodo，主句用woulddoIfitweretoraintomorrow,themeetingwouldbeputoff.Ifyoudroppedtheglass,itwouldbreak.Ifheshouldseeme,hewouldknowme.从句中有had,were,should，可将其提到主语前，并去掉if。IfIwereyou,Iwoul
5、dhelphim.=WereIyou,Iwouldhelphim.Ifhehadenoughmoney,hewouldbuythatbook.=Hadheenoughmoney,hewouldbuythatbook.Ifheshouldseeme,hewouldknowme.=Shouldheseeme,hewouldknowme.Butfortherain,weshouldhavehadapleasantjourney.要不是下雨,我们的旅行肯定会很愉快。Withoutyourhelp,wecouldnothavefinishedintime.要不是你帮忙,我们肯定不能及时完成任务。
6、butfor,without等引出一个介词结构也可表示条件,条件常常是虚拟的,或与事实相反的假设。如:Grammar1-1Lookatthesesentencesfromthepassage.Ifyousaytheword“communication”,mostpeoplethinkofwordsandsentences.Weuse“learned”bodylanguagewhenweareintroducedtostrangers.Nowtickthetruestatements.Thesentencesfromthepassage…1.describecommonsituation
7、s.2.describeimpossiblesituations.3.useiforwhentointroducethesituation.4.explaintheresultofthesituationintheotherpartofthesentence.5.usethepresentsimpletenseinbothpartsofthesentence.Grammar1–2.findmoreexamplesofsentenceswithi
