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1、语法讲解之状语从句含义及分类状语从句主要用来修饰主句或主句的谓语。一般可分为九大类,分别表示时间、地点、原因、目的、结果、条件、让步、比较和方式。时间状语从句定义:指从句在句中作时间状语。引导词:when,whenever,as,while,since,till,until,before,after,assoonas,once等基本用法:英语中时间关系表达法主从句之间时间关系引导词同时发生as,when,while主句在后after,when主句在前before,when主句在从句瞬间之前发生hardly…whennosooner…than,sc
2、arcely… when主句随从句发生when,whenever,eachtime主句在从句发生瞬间之后发生assoonas,once,theminute,immediately,themoment主句动作开始时间since,eversince主句动作结束时间till,untilExamplesAfterChristmasandNewYearcomestheChineselunarNewYear---theSpringFestival.SomanythingshadtobesettledbeforeIcouldleaveNewYork.Shewas
3、havingagoodtimewhenIsawherinthepark.Whilethetrainwasstillmoving,agreatmanymensuddentlyjumpledout.Infact,ancientpeoplecelebratedtheNewYearevenbeforetheyhadwaysofmeasuringtime.Justgostraightuntilyoureachthecrossroad.PleasewritetomeassoonasyouarriveinBeijing.when,as和while1,当when,
4、as,while表示“在…一段时间里”,主从句的动作同时发生时,可以换用。如:While(When或As)thechildrenwereplayingcomputergames,Mr.Smithcamein.2,when,while后可以接分词短语。如:Whenreadingbooks,helikestomakesomecomments.TheyboughtalotofthingswhilespendingtheirholidaysinParis.whenWhen可指一段时间,也可指一点时间,既可指一时性的动作,也可表示持续的动作,因此其所引导的时
5、间状语从句的谓语动词既可以用延续性动词,又可以用瞬间动词,其所引导的动作既可以发生在主句动作之前,也可以发生在主句动作之后,还可以表示与主句动作同时发生。WhenIwasteachinginthatcollege,IusedtogototheseashoreonSundays.我在那所大学教书时,周日经常去海边玩。(延续性动词,一段时间,主从句动作同时发生)Whenthelessonwasover,webeganourwriting.下课以后我们开始写作。(瞬间性动词,一点时间,从句动作发生在前)Helpcamewhenwefinishedthet
6、ask.我们任务完成了才有人来帮我们。(瞬间性动作,一点时间,从句动作发生在后)WhileWhile:指的是“在某一时间里”,“在……期间”,和……同时从句里的动作必须是持续性的,切不可用瞬间动词。E.g.WhilehewasinLondon,hemadealotoffriendsthere.While:也可做并列连词,表示对照的意思。E.g.WhilewewerewatchingTV,motherwascookinginthekitchen.While(表示让步),尽管虽然E.g.WhileIunderstandwhatyousay,Ican’t
7、agreewithyou.asas表时间,与when相似,引导持续性动作,但侧重强调主从句动作同点或同段进行,可译为“一边……一边”。Hehurriedhome,lookingbehindashewent.Isawyoursisterasshewasgettingonthebusyesterday.Hesangashewalked.一……就AssoonasIsawhimwalkingtowardsthediner,Iwouldputhisorderinwithouthimevenneedingtoask.一看见他向餐馆走来吃晚饭,不用他点我就会把他
8、的菜单拿进去准备。Thedayhermotherwasback,AnnieretunedCaseytotheapartme