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1、状语从句（1）的回顾一、时间状语从句表示时间的状语从句可由when,as,while,whenever,after,before,till(until),not…until,since,once,assoonas,nosooner…than,hardly(scarcely,barely)…when,everytime(eachtime),themoment,thefirsttime(thelasttime),bythetime,等引导。1.whenE.g.Whenhecomesheretomorrow,I’llcallyou.(atthattime)Henryisin
2、chargeoftheofficewhenMr.Smithisaway.(duringthetimethat)2.whileE.g.Whilehewaswalkinginthestreet,hemetTim.(分词短语）---Whilewalkinginthestreet,hemetTim.---Walkinginthestreet,hemetTom.HelearnedtospeakEnglishwhilehewashere.Iliketeawhileshelikescoffee.3.asE.g.Astheywerepickingtea,thegirlsweresin
3、ginghappily.(一边...一边）Shesangassheworked.(随着)辨析：when,while,as表“当...时”相同点：当从句的谓语是延续性动词时，三者常可互换E.g.When/While/Aswewerestilllaughing,theteachercamein.不同点：1)when既表“时间段”又表“时间点”(=duringoratthetimethat),从句中动词既可是终止性的，也可是持续性的，还可表“正在这时”E.g.WhenIarrivedthere,theywerewatchingTV.WhenIwasyoung,Ilikeds
4、inginganddancing.Wewereabouttogototownwhenitbegantorain.2)while只表“时间段”(=duringthetimethat),从句中动词只限于持续性动词，它有时含对照之意，表“然而”E.g.Hefellasleepwhilehewasstudyinghisgrammarbook.Iwasreadingwhilehewasplaying.3)as用法与when相似，但它侧重动作的同时性，表“一边...一边...”，还表“随着”E.g.Theytalkedastheywalked.Astimegoesby,weget
5、wiser.4.before：“……就……”，“不到……就……”，“……才……”，“趁，还没来得及”，before从句中谓语一般不用否定形式E.g.Hemadealistofwhathewantedtobuybeforehewenttothesupermarket.Wehadsailedfourdaysandfournightsbeforewesawland.Wehadnotrunamilebeforehefelttired.Pleasewriteitdownbeforeyouforgetit.Itwillbe+一段时间+beforesomebodydoes,“多久
6、之后才……”。E.g.Itwillbelongbeforeyoumasterit.Itwon’tbelongbeforeyoumasterit.5.afterE.g.Afterhe(had)finishedhiswork,heleftthere.==Afterfinishinghiswork,helefthere.(==Havingfinishedhiswork,helefthere.)6.sinceE.g.Ihaveknownhimeversincehewasaboy.Hehadworkedheresincehehadgraduatedfromtheuniversi
7、ty.Itis(hasbeen)twoyearssincehecamehere.Itwas(hadbeen)twoyearssincehehadcomehere.7.until(till),notuntil1)肯定句：主句谓语动词必需是延续性动词，主句从句都为肯定式，意为“某动作一直延续到某时间才停止”。E.g.Heremainedthereuntilshearrived.Youmaystayhereuntiltherainstops.2)否定句：主句谓语动词必需是非延续性动词，从句是肯定式，意为“某动作直到某时间才开始”。E.g.Hewillnot
