英语中三大类从句.ppt

状语从句状语从句按意义和作用可分为时间、地点、原因、目的、结果、方式、让步、条件和比较等九种。状语从句放在主句之前常用逗号隔开；放在主句之后不用逗号。1时间状语从句：⑴when,whenever,as,while,before,after,until,since,once,assoonas等引导的时间状语从句。Whenthebellrang,theguardwaswaitinginhisseat.Youmaycometomyrestaurantwheneveryoulike.Whileantsgrow,theychangetheirformsthreetimes.Afterthestudentswereallinthechemistrylab,theprofessorbroughtoutthreebottles.Threemonthswentbybeforetheyknewit.Shewentoncuttingandcuttinguntilshecametotheendofabrook.Iwaittillhehadfinishedhistask.Onceyouremindmeoftheoldman,Iwillcertainlyrememberhim.Assoonasshegothome,shebeganherhousework.第29页，共54页，星期日，2025年，2月5日由theminute,themoment,theinstant,theday,theweek,theyear,thefirsttime,anytime,nexttime,everytime,eachtime,thelasttime,allthetime,fromthetime,bythetime,immediately,instantly,directly等引导的时间状语从句IrecognizedyoutheminuteIsawyou.Themachinestartsthemoment/theinstantthebuttonispressedWeweretheretheweek/thedayitsnowedheavily.DoctorLiwasintheUnitedStatestheyeartheSecondWorldWarbrokeout.Nexttimeyoucome,youwillseeyourgrandpa.Youarewelcometocomeanytimeyouwantto.EverytimeIcatchacold.Ihavepaininmyback.Thefirst/lasttimeIsawJames,hewaslyinginbed.TwelveofustookaEuropeanmealallthetimewewereinChina.Thetruckwillhavearrivedbythetimeyouhaveallthethingspackedup.Youmustshowthegentlemaninimmediatelyhecomes.Directlyheappeared,therewasadeadsilence.第30页，共54页，星期日，2025年，2月5日when,while,as的用法区别⑴when引导的时间状语从句，其中的动词既可以是延续性的也可以是瞬间性的；而且可以表示主句的动作和从句的动作同时发生，或者从句的动作发生在主句的动作之前。如：Whenthebellrang,weallstoppedtalking.WhenIwasamiddleschoolstudent,Ialwaysplayedtabletennis.注：when可连接两个并列分句，表示“正在这时／那时”。前面的分句可以用一般过去时，过去完成时或was/wereaboutto,was/wereonthepointof,was/wereonthewayto.如