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1、第七章、状语从句一、时间状语从句：1.when/while/aswhen具有突然性，beaboutto…when,beonthepointofdoing…,when,was/weredoing…when,hadjustdonewhen;when还可引导原因状语从句，“既然”。Whyareyoulookingforanewjobwhenyouhavegotsuchagoodone?While表示当……的期间和过程。比较：Whenmymothercameback,Iwasdoingmyhomework.WhileIwasdoingmyhomeworkmymothercameback.Wh
2、ile还用于让步状语从句，“尽管”。WhileIagreewithsomethingyousaid,Idon’tagreewitheverything.While还可引导对比和转折。Somestudentsarehardworkingandmakerapidprogress,whilesomeareratherlazy.As表示“随着……”，强调同步和伴随。Astimewentby,Snowwhitegrowmoreandmorebeautiful.As还可引导定语从句。Asisreported,theprojectwillbefinishedintwoweeks.Asisoften
3、thecasewithsb,Asismentionedabove,Asiswellknown,As引导让步状语从句：adj/adv/n/vas主语+谓语As还可引导原因状语从句，因为。Asheisyouryoungerbrother,youshouldtreathimbetter.2.before“才……，就……，还来不及……，趁还没……”Threedayswentbybeforethepolicecaughtthethief.ThemanagerhadlefttheofficebeforeIcouldtellhimmyexcuse.Thepietastesgoodbeforeiti
4、scold.3.名词做连词。time的短语：thefirsttime,lasttime(上次),thelasttime（最后一次）,everytime,eachtime,nexttime（下次）,thenexttime（后来一次）。表示“一……就……”:themoment,theminute,thewhile,theinstant4.副词做连词。Immediately,instantly，directly“一……就……”5.sbhadhardlydone…,when…=Hardlyhadsbdone,when….Sbhadnosoonerdone….than…=Nosoonerhad
5、sbdone…,than…Ihadhardlygothomewhenthetelephonerang.=hardlyhadIgothomewhenthetelephonerang.6.since自从……Ithasbeen3yearssincehewasasoldier.自从他没当兵（退伍）已经三年。since从句中状态是表示过去，否定翻译。二、地点状语从句5Remembertoputbackthebookwhereitis.Whereveryouare,whateveryoudo,Iwillberightherewaitingforyou.三、原因状语从句because,直接原因，w
6、hen,反问“既然……为什么……?”,since既然，表推理，as陈述事实，for分析判断。介词结构：considering,seeing,given名词/从句四、条件状语从句if/unlessonconditionthat/ononeconditionso/aslongas只要sofaras就……而言介词结构：provided/providing,suppose/supposing,imagine,assuming五、让步状语从句1.though/although*though置于句末，变为副词,类似还有incaseIdidn’tsleepverywelllastnight.Ido
7、n’tfeelverytired,though.2.evenif/eventhough3.*whileWhilethedevelopmentofsciencebringsusalotofconvenience,itisnotwithoutitsproblems.4.*however/nomatterhowadj/adv主语+谓语Howeverdifficultitis,wehavetofinishthetaskontime.5.Adj/adv/v/n+as
