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1、状语从句状语从句按其意义和作用可分为:1.时间状语从句2.地点状语从句3.原因状语从句4.目的状语从句5.结果状语从句6.条件状语从句7.方式状语从句8.比较状语从句9.让步状语从句1、时间状语从句引导时间状语从句的从属连词有：when,while,as,whenever,before,after,since,till,until,assoonas,once,hardly…when,nosooner…than等引导。如：Whenhewasstillayoungman,hewasforcedtoleavehishomelandforpoliticalreasons
2、.Ithasbeen15yearssinceheleft.I’lltellhimthenewsassoonasIseehim.Onceyouhavegotusedtoit,youwilllikeit.Iwaitedtillhehadfinishedhiswork.注意：1.when,while,aswhen(1)表“当…的时候”，即可引导持续性动作，又可引导短暂性动作。如：IwasfatwhenIwasachild.Whentheycamehome,Iwascookingdinner.when(2)表“突然；就在那时”句型有：…was/weredoing…whe
3、nsb.did… …was/wereabouttodo…whensb.did……had(not)done…whensb.did…IwaswalkinginthestreetwhenIsawhim.Tomwasabouttotelltheteachereverythingwhenhisdeskmatestoppedhim.Shehadnotbeenmarriedmanyweekswhenthemansawherandwasstruckbyherbeauty.while(1)表“当…的时候”指的是“在某一时间里”，“在……期间”，从句里的动作必须是持续性的，它也强调
4、主句和从句动作的同时发生，往往侧重主句和从句动作的对比。如：WhilehewasinLondon,hestudiedmusic.WhilewewerewatchingTV,hewaswritingacomposition.while(2)也可做并列连词，表示对照的含义，意思为“而，然而；虽然”。如：Heistallwhilehisbrotherisshort.WhileIunderstandyourviewpoint,Idon’tagreewithyou.as(1)引导持续性动作，侧重主句和从句的动作同时发生。Hehurriedhome,lookingbehin
5、dashewent.Isawyoursisterasshewasgettingonthebusyesterday.Hesangashewalked.as(2)也可表示“随着”，但要注意与with的区别：as是连词接句子。with是介词，接名词或词组。Asthedaywenton,theweathergotevencold.(从句，故用谓语动词）Withthedaygoingon,theweathergotevencold.(介词，故用非谓语）2.before,since的句型：Itwon’tbelongbeforesb.doessth.不久以后某人就会做……It
6、willbelongbeforesb.does很久以后某人才会做……Itwaslongbeforesb.didsth.很久以后某人才做……Itwillbe+一段时间+beforesb.does某人要过多长时间才做Itwas+一段时间+beforesb.didsth.某人过了多长时间才做Itis/hasbeen+一段时间+sincesb.didsth.自从某人做某事已经多久了Sb.hasdonesth.sincesb.didsth.自从某人做某事以来，某人已经做了…例如：Itwon’tbelongbeforewehaveourmid-termexams.Itwas
7、tenyearsbeforehereturnedhome.ItishalfayearsincewegraduatedfromtheJuniorHighSchool.Shehasbeenworkinginahospitalsinceshegraduatedfromamedicalschool.3.bythetimebythetime+现在时，主句用将来完成时．例如：Bythetimehearrives,wewillalreadyhaveleftCalifornia.bythetime+一般过去时，主句用过去完成时．例如：Bythetimehearrived,weh
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