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1、状语从句种从属连词例句说明类WhenIcameintotheroom,hewaswritingaletter.when指的是“某一具体的时间”Weshallgotherewheneverwearefree.whenever指的是“在任何时间”Iwaswalkingalongthestreetwhensuddenlywhen意为“这时”或“在那个时候”,表示某件事正在发生或someonepattedmeontheshoulderfrombehind.刚刚发生时，另一动作同时发生。这种用法的when分句
2、一Iwasabouttogoswimmingwhenourguidestopped般位于句末。常用句型：beabouttodo⋯when⋯,bedoing⋯whenme.when⋯,haddone⋯when⋯,beonone’sway⋯when⋯,beonthepointofdoing⋯when⋯Heusuallywalkswhenhemightride.Theyhadonly尽管，虽然，既然，鉴于，如果threetableswhentheyneededfive.时Howcanyouhopeform
3、ercyyourselfwhenyou间shownone?状Whileitwasraining,theywentout.while指“在某一段时间里”，“在⋯期间”，while引导的动作从Istayedwhilehewasaway.必须是持续性的IlikewatchingTVwhilehelikesreading.while做并列连词，表示相对关系“然而”whileWhileIunderstandyourpointofview,Idon’tshareWhile引导让步状语从句，相当于although
4、，但一般位于主it.句之前。Whilethereislife,thereishope.While引导条件状语从句，相当于as/solongas,翻译成“只要”Hehurriedhome,lookingbehindashewent.as引导持续性动作，强调主句和从句的动作同时发生asAsIgetolder,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⋯⋯Ashewas
5、goingout,itbegantorain.强调两个动作紧接着发生。Asaboy(Whenhewasaboy),hewashopelessatas+名词，相当于时间状语从句maths.A.Beapupilbeforeyoubecomeateacher.往往表示主句的动作先于从句的动作发生，“在⋯⋯之前”，BWewaitedalongtimebeforehecameoutA.“⋯⋯才”（强调主句所表达的时间、举例很长或花费.Wehadn’twaitedlongbeforehecameout.的力气很
6、大。）C．Hediedbeforehewroteawill.B.“⋯⋯就”（强调主句所表达的时间、举例短或花费的力D．hesunhadsetbeforeweknewit.气很大。）beforeLeavemebeforeIchangedmymind.C．“还没有⋯⋯”“免得”“不知不觉”“宁可、宁愿”“否I’ddiebeforeIapologizedtothem.则，要不然”GetoutbeforeIcallthepolice.Itwillbefiveyearsbeforehereturnstohis
7、It+（not）be+sometime+before从句。肯定句中，“多长时homeland.间之后才”；否定句中，“用不了多长时间就”Itwon’tbelongbeforewemeetagain.afterHearrivedafterthegamestarted.Wewaitedtill(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如主句动词是瞬间动词，常用否定式，表示“直⋯才”“在⋯unt
8、il/till’clock.Untilhehadpassedoutofsight,shestoodthere.以前不”,从句放在句首表示强调，一般用untilGreatchangeshavetakenplaceinChinasince1978.状语从句在主句之前时一般用逗号与主句分开，如从句在AssoonasIarriveinShanghai,I主句之后则不必用标点符号。since’llwritetoyou.Mr.Lihasbeenheresincehecamebac
