状语从句一,什么是状语从句时间状语从句1.when/wheneverWhenIcameintotheroom,hewaswritingaletter.当我进屋时，他正在写信。Weshallgotherewheneverwearefree.我们什么时间有空，我们就去那里。2.when/while/as(当……的时候）when/while后面可以直接跟分词，as则不能，as后面可以直接跟名词，when/while则不能。1）Asaboy,hetaughthimselfmanythings.2)When/Whileplayingthere,wesawmanybirds.注意:1.Iwaswalkinginthestreetwhen(suddenly)someonepattedmeontheshoulderfrombehind.我正在街上走着,就在这时忽然有人从后面拍我的肩膀。2.Myfatherwascookingwhilemymotherwasplayingcards.我爸爸在做饭而我妈妈在打牌.3.while表示“尽管”“虽然”时的用法（此时它引导的不是时间状语从句，而是让步状语从句，此用法许多同学并不熟悉，值得注意！）1）______Ireallydon’tlikeart,Ifindhisworkimpressive.(山东卷)A.AsB.SinceC.IfD.While答案选D。while在此表示“尽管”“虽然”，2)Whiletheworkwasdifficult,itwasinteresting.尽管工作有难度，但很有趣。3)WhileIunderstandwhatyousay,Ican’tagreewithyou.虽然我理解你的意思，但我还是不同意。（这时while要放在句首=although)4.when也有“尽管/虽然”的意思，这时的从句要放在句尾。1)Theykepttryingwhentheyknewitwashopeless.2)Iamsurewecansucceedwhenweadmitwehavealongwaytogo.when还有“既然”的意思表原因1）Whydoyouwantanewjobwhenyouhavegotsuchagoodone?2)ItwasfoolishofmetotakeataxiwhenIcouldeasilywalkthere.before1.Itwillbe+一段时间+before从句(does)要过好久……才能做……Itwillnotbe+一段时间+before从句(does)过不了多久……就能做……Itwas+一段时间+before从句(did)过了好久……才做了……Itwasnot+一段时间+before从句(did)没过……就做了……还要注意其变体！2.beforeIcoulddo,…(还没来得及…就…)BeforeIcouldgetinaword,thetailorhadmeasuredme.3.beforesbdoes,…(趁还没做……,……)Pleasewriteitdownbeforeyouforgetit4.hadn’tdone…beforesbdid还没…..就……Wehadn’trunamilebeforewefelttired.我们还没跑到一里路就觉得累了。5.haddone…beforesbdid…做了……才……Wehadsailedfourdaysbeforewesawland.（我们航行了四天才看见陆地）6.beforesbknew/realisedit.不知不觉地一......就......1.assoonas主从句的谓语动词有两种情况：主从句都用一般过去时、主句用一般将来时，从句用一般现在时1)Assoonashearrivedthere,hewrotetome.2)Assoonashearrivesthere,hewillwritetome.2.the+时间名词themoment/minute/instant/day/year…+句子3.immediately/directly/instantly+句子4.at+名词Atthenews,weweremovedintotears.5,on/upon+doing/含动作意味的名词on(one’s)arriving/on(one’s)arrivalonentering/onentranceonreturning/onreturn6,hardly/scarcely…when…/nosooner…than…7,everytime,eachtime,lasttime