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初二英语时间状语从句讲解与练习一、when的用法when从句的重点不在动作本身发生的状态，一个时间点，所以when多数情况下用的是一般过去时，则不用正在进行时when从句的动词大多是瞬时动词。。而主句的时态没有限制,根据具体情况而定。1.Whenhewasachildhewasalwaystryingoutnewideas.他小时候就常常试验一些新的设想。2.Whenshecameintomyroom,Iwasjustreadingabook.她走进我房间时，我正在看书。3.Wereyouwritingwhentheteachercamein?老师进来的时候，你在写信吗？4.Sorry,Iwasoutwhenyoucalledme.对不起，你打电话来的时候我出去了。5.Hewasonthepointofleavingwhensomeoneknockedatthedoor.他正要走，这时有人敲门。二、while的用法while表示的是一段时间，是一个过程。：当while事件正在发生的时候，另一件事如何如何，所以while从句一般用的是正在进行时。1.Whilemywifewasreadingthenewspaper,IwaswatchingTV.当妻子正在看报纸的时候，我正在看电视。2.WhileJimwasmendinghisbike,LinTaocametoseehim.正当吉姆修自行车时，林涛来看他。3.Whiletheyweretalking,thebellrang.正在他们谈话的时候，上课铃响了。4.Youcan’tdoyourhomeworkwhileyou’rewatchingTV.你不能一边看电视一边做家庭作业。5.WhileJohnwassittingbitinghisnails,Iwasworkingoutaplantogetushome.约翰坐在那里咬指甲时，我正在制定一个回家的计划。6.Strikewhiletheironishot.趁热打铁。三、when,while,as的互换如果从句动作和主句动作同时发生，并且从句动作为延续性动词时，when，while，as可以互换使用。这种情况下，它们的细微区别恐怕连英、美人自己也说不清了。1.When/While/Asweweredancing,astrangercamein.当我们跳舞时，一位陌生人走了进来。[dance为延续性动词]2.When/While/Asshewasmakingaphonecall,Iwaswritingaletter.当她在打电话时，我正在写信。[make为延续性动词]3.While/When/AsIwaswalkingdownthestreet,Inoticedapolicecarinfrontofthebank.我顺着马路往前走时，发现银行门前停着一辆警车。2）比较until和till此两个连词意义相同。肯定形式表示的意思是“做某事直至某时”，动词必须是延续性的。否定形式表达的意思是“直至某时才做某事”。动词为延续性或非延续性都可以。正确使用这两个连词的关键之一就在于判断句中的动词该用肯定式还是否定式。肯定句：Isleptuntilmidnight.我一直睡到半夜时醒了。WaittillIcallyou.等着我叫你。（在肯定句中可用before代替。例如：Let'sgetinthewheatbeforethesunsets.）否定句：Shedidn'tarriveuntil6o'clock.她直到6点才到。Don'tgetoffthebusuntilithasstopped.公共汽车停稳后再下车。Ididn'tmanagetodoituntilyouhadexplainedhow.直到你教我后，我才会做。区别：1）until可用于句首，而till通常不用于句首。例如：Untilyoutoldme,Ihadheardnothingofwhathappened.直到你告诉我以前，出了什么事我一点也不知道。3)Since自从。。。。意味一段时间。主句常用现在完成时，从句用一般过去式。后跟过去时间点/一段时间+ago/句子1.DavidhaslivedinBeijing______2008.2.Ourschoolbasketballteamhaswonfivemedals____Ienteredit.四．beforeafter的用法1.Wemustfinishreadingthebooks___goinghome.2.Heworkedinthecarfactoryfortwoyears______hegradtuatedfromcollege.3_______wehavelunch,weshouldwashhands.before,after即可以作连词，后跟从句，又可以作介词，跟名词/代词/动词ing.练习：在下列各句的空格中填入适当的连词1．_________hecomestomorrow,Ishallaskwherehehasbeen.2．_________hewasspeaking,everybodylistenedcarefully.3．Isawherjust_________shewasgettingoffthetrain.4．Haveagoodlookatthatman_________youpasshim.5．Itwasalreadyeighto'clock_________wegotthere.6.Iwasabouttogoout_________avisitorcame.7．We'llgotothecountryatthebeginningofJune,______thesummerharvestwillstart.8.HelearnedtospeakGerman_________hewasinBerlin.9.Henryisinchargeoftheoffice________Mr.Smithisaway.10.Ilistentotherecorder_________Ihavetime.11.HehadlearnedChinese_________hecametoChina.12._________theworkwasdone,wesatdowntosumupexperience.13.Ihaven'tseenhim_________hemovedtotheothersideofthetown.14.Iwaited________hecameback.15.Itwasnot________hetookoffhiseyeglassesthatIrecognizedhim.16.Shelikeseverythingtobeinplace________shestartstowork.17.Thethievesranaway_________theycaughtsightofthepolice.18.Theydecidedtogobackhome_________theirmoneyranout.19.Weplayedoutsidetillsunset,_________itbegantorain。20.__________Igettotheairport,Iwillphoneyoutopickmeup.21.Theywereabouttoleave______itbegantorain.22.Healwaysstayinbed______lunchtime.23.Ilikeplayingtennis_________myyoungersisterpreferswatchingballgames.24._________Iunderstandyourviewpoint,Idon’tagreewithyou.25._______shegrewolder,shebecamemoreresponsible.26.HewatchestheNBNgames___thereisoneonTV.27.Davidoftengoestoplaybasketball______schoolisover.28.Ihavebeencrazyaboutplayingbasketball_______Iwasalittleboy.29.Jane’skneeshurtbabdly_______itrains.30.Theteacherdidn’tbeginherclass______thestudentsstoppedtalking.31MrWanglikespopmusic_______hiswifelikesclassicalmusic.32.Thedooroftheliftwasclosed_______Icouldwalkin.33.Youwon’tknowthevalueofhealth______youlose.34.Mumwaswashingclothinginthewashingroom______thetelephonerang.35Whileshe_______TVinthesittingroom,thebell______Awatched,rangBwaswatching,isringingCwaswatching,rangDwatched,wasringing37.Theywillstartthepartyassoonastheirteacher____(arrive)38.IfeelbadwheneverIdrinksomethingcold.翻译汉语。39.每当杰克参加晚会时，他就会穿上自己的黑衣服。_______Jack___________,heputsonhisblacksuit.40.He______(notleave)___________whathewants.等他得到了他所要的东西才会离开Key:1.When2.While/When3.as4.when/as5.when6.when7.when8.while9.while10.whenever11.before12.After13.since14.till/until15.until16.before17.assoonas18.before19.when20.Assoonas21.when22.until23.while24.While25.As