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1、状语从句本质用不同的连接词将主句与一个或几个分句连接起来，以表达主句与分句之间的逻辑关系。主句分句连接词逻辑关系时间、地点、原因、目的、结果、条件、让步、比较、方式时间状语从句用来说明主句动作与从句动作发生时间上的先后关系类型常用连接词特殊连接词重点时间状语从句 when, while, as, before, after, since, till, until, as soon as 名词：the moment, the instant, the minute, the day, next time, everytime 副词：instantly,immediately, directly连
2、词：no soonerthan,Hardlywhen, scarcelywhen主句从句的时态搭配，延续性动词与非延续性动词的区别1. when引导的时间状语从句可以理解为“当的时候”时态搭配主从句都是过去时态主从句都用现在时态主句将来时态从句现在时态辨析The performer will already have played the music when we get there.The performer will be playing the music when we get there.是否可以用while来替换?It is challenging for a company t
3、o remain inter-nationally competitive while the global economics are receding. when, while, as 用法的区别when相当于at that time，引导的状语从句中谓语动词可以是延续性的也可以是非延续性的while，as相当于during that time, 引导的状语从句中谓语动词通常是延续性的随着英特网变得日益商业化，网络的使用对商人们非常有利。As the Internet becomes more and more commercialized, it is in the interest o
4、f business to universalize access.公司很难在经济衰退的环境下保持自身的国际竞争力。It is challenging that commercial organizations remain globally competitive, while the economics is receding.2. before, after 引导的时间状语从句before 可理解为在之前，after 可理解为在之后主从句时态可明显体现动作的先后顺序We should do everything for what we want before it is getting
5、too late. He had never gambled before the casino sent him a coupon for 20 dollars worth of gambling.3. since，until 引导的时间状语从句主句中的动作从句中的动作 后发生先发生用since引导先发生并且一直持续一直持续后发生且非延续用until引导（1）since 从句中的非延续性动词可以表示一个时间点。I have worked in this company since I graduated.He has written to me since I fell ill.而由sinc
6、e引导的状语从句中如果出现延续性动词的一般过去式，表示该状态结束的时间点I have worked in this company since I was a student.He has written to me since I was ill辨析He hasnt contacted me since I worked in that company.He hasnt contacted me since I have worked in that company.since引导定语从句中谓语动词是延续性的，那么一般过去时表示动作结束的时间点，完成时表示动作开始的时间点。（2）until
7、状态+until+时间点状态可以用延续动词表示，非延续动词的否定形式表示。He had to stay abroad until the World War II came to the end.He couldnt return his homeland until the World War II came to the end.notuntil结构常用的否定词还包括never, hardly, scarcely, rarelynotuntil正常结构Ice cream did not reach America until about the middle of the eighteen
8、th century.until置于句首Until about the middle of the eighteenth century, ice cream did not reach America.notuntil置于句首（倒装）Not until the 1982 Convention was adopted, could the argument be made that there existed adequate and comprehensive maritime treaty law as such for the larger part of the world commu
9、nity.4.表示“一就”的结构（1）引导词as soon as, immediately, the moment, the minute从句动作先于主句动作no soonerthan., hardlywhen, scarcelywhen主句动作先于从句动作It began to rain as soon as I arrived home.No sooner had I arrived home than it began to rain.5. 其他短语引导的时间状语从句介词短语at the time, during the time, by the time其中by the time常与过
10、去完成时与将来完成时连用He had already left by the time they arrived.He will already left by the time they arrive.名词短语next time, every time, the day, for the first timeIn the classic childrens tale, the puppet Pinocchios nose grows longer every time he tells a lie.The first time I can actually remember hearing
11、itin public anyway, was when Prince Charles was leaving Australia by boat. 二 地点状语从句1引导词 where, wherever, anywhere, everywhereWhere they occur, work songs often exhibit the song culture of a people in a fundamental form.Everywhere they appeared, there were ovations.2 wherever引导地点状语从句表达一种强调的语气，要与让步状语从
12、句进行语义上的区分Wherever your school is located, you will be met by the Foreign Affairs Officer at the final point of the journey.Where there is a will, there is a way.A driver should slow down where there are schools.People prefer to work where they can fully display their talents.三 原因状语从句表原因连词 because, f
13、or, as, since介词 because of, due to, owing to可以表示原因，但不能做从句连接词其他 in thatseeing (that), now (that), considering (that), given (that)not thatbut thatinasmuch as, insomuch as, in as much asin so much as1 because, for, as, since （1）because 语气最强，只有because 才能回答why的提问，只有because才能用only, just, perhaps修饰 Perhap
14、s because most of todays cross-cultural marriages occur because of “true love”, these couples work hard to overcome their difference. because的否定转移 主句是否定的情况下，because引导的从句可能是按正常情况理解即否定主句谓语，也可能是按否定转移来理解（否定从句），具体如何理解要结合上下问进行语义分析。 He doesnt exercise because he likes to.A. He likes to exercise by himself.
15、B. He exercises for reasons other than enjoyment.C. Hes glad he doesnt have to exercise.D. He doesnt have enough time to exercise. In 1600 the earth was not the center of the universe because the majority then supposed it was; nor because she had more readers was Ella Wheeler Wilcox a better poet than Father Hopkins.（2）as, since, for 语气较弱，常用来表示众所周知显而易见的原因。其中for不能用于句首。As Monday is a national holiday, all government offices wi
