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•Thatnightastheyslept,thetrainrushedacrossthetopofLakeSuperior,throughthegreatforestandsouthwardtowardsToronto.•此句中as译为“当…时候”，引导时间状语从句。•辨析：when;while;as•①when–既可以引导一个延续性动作，也可以引导一个短暂动作，可用于主句和从句动作同时发生，也可用于从句动作先于主句。•②while–引导的动作必须是延续性的，侧重于主句动作和从句动作相对比。•③as–可表示从句和主句的两个动作交替进行或同时发生，可译为“一边…一边…”•1When/whileIlivedthere,IusedtogotoseashoreonSundays.•2WhentheyreturnedfromParis,theyweretired.•3IreadtheletterasIwalkedalongtheriver.•4Iwaswanderingonthestreetwhenapersonpatmeontheshoulder.•5WhileIadmitthatthereareproblems,Idon’tagreethattheycannotbesolved•6John,apoorman,sanghappilyalldaywhenhisneighborswerebusyandanxiousabouttheirwealthandneversang.while•Astimewentby,shebecamemoreandmorebeautiful.•此句中as译为“随着”，用来引导时间状语从句。•(同义句)Withtimegoingby,shebecamemoreandmorebeautiful.•Asthesocietydevelops,ourlifewillbecomebetterandbetter.•Withthesocietydeveloping,ourlifewillbecomebetterandbetter.•Astimegoeson,it’sgettingwarmerandwarmer.•Withtimegoingon,it’sgettingwarmerandwarmer.•此句中的as译为“按照，如同”，引导方式状语从句。•DoasItoldyoutodoit.•Doasyouweretoldtodoit.•WhenIRome,doastheRomansdo.•此句中的as译为“因为”，引导原因状语从句。•辨析：because;since;as;for•①because–表示听者未知的原因，也可用在强调句式中成为被强调的部分。•②since–表示听者或读者已知的原因，意思是“既然”。•③as–与since接近，但原因程度比since更强烈。•④for–不表示直接原因，只是为所说的话提供判断的理由，引导分句不能放在句首。•此句中的as译为“正如，正像”，引导非限制性定语从句。关系代词as既可以引导非限制性定语从句，也可引导限制性定语从句，as在从句中作主语，宾语或表语。•引导限制性定语从句的as常用于下列句式：•Such/such/thesame+n…as•1thesame…as…•thesame…that…•2so/such…as…•so/such…that…同类异物同类同物As引导定语从句That引导结果状语从句关系代词as/which引导非限制性定语从句的区别•As引导的非限制性定语从句既可以放在主句前，又可放在主句后，有时可以插入句中，且本身有“正如，正像”的意思，而which引导的非限制性定语从句只能位于主句之后，且本身没有任何含义，相同的是两者都可替代主句的整个内容，而不是主句中的某个词，即他们的先行词都可以是一个句子。•Asisknowntoeverybody,themoontravelsroundtheearthonceeverymonth.•Themoontravelsroundtheearthonceeverymonth,as/whichisknowntoeverybody.•(用it改写)Itisknowntoeverybodythatthemoontravelsroundtheearthonceamonth.•(用what改写)Whatisknowntoeverybodyisthatthemoontravelsroundtheearthonceamonth.•As…as…意为“像…一样”，表示同级比较，但是第一个as是副词，第二个as是连词，引导比较状语从句，其基本结构是as+adj/adv原级+as；其否定结构是not…so/as...as.•IspeaksEnglishaswellasMary.•(否定句)Idon’tspeakEnglishas/sowellasMary.•HenryisaworkerasgoodasPeter.•HenryisasgoodaworkerasPeter.•…as+adj+a/an+n+as…•(so/how/too)•Pleaseanswermyquestionassoonaspossible.•Shelooksasbeautifulasbefore.倍数表达法•倍数+as+形容词/副词原级+as……•倍数+形容词/副词比较级+than……•倍数+the+性质名词(size/length/width等）+of•这条路是那条路的四倍长。•Theroadisfourtimesaslongasthatone.•Theroadisthreetimeslongerthanthatone.•Theroadisfourtimesthelengthofthatone.•此句中as译为“虽然，尽管”，引导让步状语从句。•(同义句)Although/thoughheisyoung,heknowsmuch.•辨析：although；though；as引导的让步状语从句•①although引导的让步状语从句不可以发生倒装；though引导的让步状语从句可倒可不倒，as引导的让步状语从句必须发生倒装。•②as/though从句一般放在主句前，常用倒装语序，从句中的表语、状语、或动词原形置于句首，即：n/adj/adv/do+主语+谓语+主句；若表语是单数名词，前置时要省略冠词。•①Althoughhewasaking,hewasunhappy.•Kingashewas,hewasunhappy.•②Althoughheissuccessful,heisnotproud.•Successfulasheis,heisnotproud.•③AlthoughTomisyoung,heisknowledgeable.•YoungasTomis,heisknowledgeable.•④AlthoughIlikeParismuch,Icouldn’tlivethere.•MuchasIlikeParis,Icouldn’tlivethere.•⑤Althoughtheytriedhard,theycouldn’tmakeherchangehermind.•Hardastheytried,theycouldn’tmakeherchangehermind.•⑥Althoughhemighttry,hecouldn’tsolvetheproblem.•Tryashemight,hecouldn’tsolvetheproblem.•⑦AlthoughIlostmoney,Igotalotofexperience.•LostmoneyasIdid,Igotalotofexperience.