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1、状语从句状语从句用于修饰主句中的动词、定语、状语或整个主句，通常由从属连词引导，按其意义和作用可分为时间、地点、条件、原因、让步、目的、结果、方式、比较等九种。学习和掌握英语的状语从句的最佳方法是熟记引导各种状语的从属连词和词组，如下表中所示:表1常用引导状语从句的连伺类型常用连词时间when,while,as,assoonas,before,after,since,till,(not)…until,once,immediately,directly,themoment,everytime,eachtime,themi
2、nute,theinstant,nosooner...than.・・,hardly...when地点where,wherever条件if,unless,as/solongas,onconditionthat,provided/supposingthat,intheeventthat,incasethat原因because,as,since,now(that),seeing(that),inthat,considering(that)让步though,although,evenif,eventhough,as,nomat
3、ter(what,when...),whatever,whether,graniedthat方式as,asif,asthough,theway目的sothat,inorderthat,lest,forfearthat,incase结果sothat,so...that,such...that比较than,(not)as...as,notso...as,the...the...1.时间状语从句［例句］Wetakethisabilityforgranteduntilwefacethetaskofteachingamachin
4、ehowtodothesame.［译文］我们一直对这种能力视为当然，直到我们面临着怎样教机器来做同样的事。［例句］Whenthetransmitterisswitchedon,infra-redsignalsaresentfromthetransmittertothereceiver.［译文］当发射机接通时，红外线信号从发射机发射到接受器。［例句］Oncetheanalogsignalisdistorted,thedistortioncannotberemovedbyamplification.［译文］一旦模拟信号产生
5、失真，该失真也无法通过放大器消除。［例句］Eachtimeapulseisappliedtotheclockinputofaflip-flop,itsoutputschangetheirlogicstatefromhigh(logic1)tolow(logic1)orviceversa.1译文］每当对触发器的时钟输入端施加一个脉冲，输出端的逻辑状态就会从高电平（逻辑1）跳变到低电平（逻辑0）,或者相反。2.地点状语从句［例句］Communicationsystemsarefoundwhereverinformation
6、istobetransmittedfromonepointtoanother.［译文］哪里需要把信息从一地传到另一地，哪里就有通信系统。［例句］Thedetectedvideosignalisfedtotheinputoftheaudiostring,wheretunedcircuitsisolatedtheaudiocarrier,whichisnowat4.5MHz.［译文］检出的图象信号再馈入音频电路系列的输入端，在此处，调谐电路把4.5MHz的声音载波分离出。2.条件状语从句［例句］Forinstance,it
7、wouldfailifthepatternsaredistortedduetotheimagingprocess,viewpointchange,orlargeintraclassvariationsamongthepatterns.［译文］例如，当模式因成像过程、视点变化或同一模式类别中模式间的较大差异而产生失真时，模板匹配的方法就不适用.［例句］TheoutputofaNANDgate,however,stayshighunlessallitsinputsarehigh.［译文］然而一个“与非”门的输出总是高电平，
8、除非它所有输入均为高电平。3.原因状语从句［例句］Modernelectroniccircuits,however,oftenusedigitalsignalsbecausetheycanbeprocessedmoreeasily.［译文］然而，现代电子电路经常使用数字信号，因为他们易于处理。［例句］Thisishopefulne
