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1、状语从句种类从属连词例句说明时间状从whenWhenIcameintotheroom,hewaswritingaletter.Weshallgotherewheneverwearefree.when指的是“某一具体的时间”whenever指的是“在任何时间”Iwaswalkingalongthestreetwhensuddenlysomeonepattedmeontheshoulderfrombehind.Iwasabouttogoswimmingwhenourguidestoppedme.when意为“这时”或“在那个时候”,表示某件事正在发生或刚刚发生时，另一动作同时发生。
2、这种用法的when分句一般位于句末。常用句型：beabouttodo…when…,bedoing…when…,haddone…when…,beonone’sway…when…,beonthepointofdoing…when…Heusuallywalkswhenhemightride.Theyhadonlythreetableswhentheyneededfive.Howcanyouhopeformercyyourselfwhenyoushownone?尽管，虽然，既然，鉴于，如果whileWhileitwasraining,theywentout.Istayedwhilehe
3、wasaway.while指“在某一段时间里”，“在…期间”，while引导的动作必须是持续性的IlikewatchingTVwhilehelikesreading.while做并列连词，表示相对关系“然而”WhileIunderstandyourpointofview,Idon’tshareit.While引导让步状语从句，相当于although，但一般位于主句之前。Whilethereislife,thereishope.While引导条件状语从句，相当于as/solongas,翻译成“只要”asHehurriedhome,lookingbehindashewent.as引
4、导持续性动作，强调主句和从句的动作同时发生AsIgetolder,Igetmoreoptimistic.两种正在发展或变化的情况，有“随着”的意思，表时间的推移。Hehurriedhome,lookingbehindashewent.一边……一边……1Ashewasgoingout,itbegantorain.强调两个动作紧接着发生。Asaboy(Whenhewasaboy),hewashopelessatmaths.as+名词，相当于时间状语从句beforeA.Beapupilbeforeyoubecomeateacher.BWewaitedalongtimebeforehe
5、cameout.Wehadn’twaitedlongbeforehecameout.C．Hediedbeforehewroteawill.D．hesunhadsetbeforeweknewit.LeavemebeforeIchangedmymind.I’ddiebeforeIapologizedtothem.GetoutbeforeIcallthepolice.往往表示主句的动作先于从句的动作发生，“在……之前”，A.“……才”（强调主句所表达的时间、举例很长或花费的力气很大。）B.“……就”（强调主句所表达的时间、举例短或花费的力气很大。）C．“还没有……”“免得”“不知不觉
6、”“宁可、宁愿”“否则，要不然”Itwillbefiveyearsbeforehereturnstohishomeland.Itwon’tbelongbeforewemeetagain.It+（not）be+sometime+before从句。肯定句中，“多长时间之后才”；否定句中，“用不了多长时间就”afterHearrivedafterthegamestarted.until/tillWewaitedtill(until)hecameback.如主句动词是持续性动作，常用肯定式，表示“直到…为止”Shedidn’tstopworkinguntileleveno’clock.
7、Untilhehadpassedoutofsight,shestoodthere.如主句动词是瞬间动词，常用否定式，表示“直…才”“在…以前不”,从句放在句首表示强调，一般用untilsinceGreatchangeshavetakenplaceinChinasince1978.AssoonasIarriveinShanghai,I’llwritetoyou.状语从句在主句之前时一般用逗号与主句分开，如从句在主句之后则不必用标点符号。Mr.Lihasbeenheresincehecameba
