表语从句ppt课件

.,Unit2ThePredictiveClause,welcome,.,Revision：定语从句的功用：,相当于一个形容词，修饰一个名词或代词（即先行词）。常紧跟在先行词后，作定语用。,如：Idontlikethemanwhowearsabeard.,宾语从句的功用：,相当于一个名词，作及物动词、形容词或介词后的宾语,表语从句的功用：,如：IdontknowwhereIcangotsomuchmoney.Itdependsonwhetherwehaveenoughmoney.Iamsurethathewillcomethisafternoon.,相当于一个名词，作连系动词如:be,look,taste,seem等后的表语。,.,一、表语从句的定义：表语从句在复合句中作主句的表语。表语从句和主语指同一内容，它对主语进行解释、说明，使主语的内容具体化。,二、表语从句的表现形式,1.由从属连词引导。如：“that”,“whether”Thequestioniswhetherweshouldaskthemforhelp.Thetroubleisthathehasneverdonetheworkbefore.,2.由连接代词引导。如：“what”“who”“whom”“whose”“which”Guilinisnotwhatitusedtobe.Whatshewantstoknowiswhichdresssheshouldbuy.,3.由连接副词引导。如：“when”“why”“where”“how”“because”ThatiswhereLuXunusedtolive.Thatiswhyhedidntpasstheexam.,4.另可由asif,asthough引导。如：Itlooksasifitweregoingtorain.,.,表语从句两大要素:,除that外的所有引导词都有自己的意义。除that,whether外的所有引导词都须在从句中充当相应的成分。,.,一些引导词的用法（一）,that在表语从句中,又。Thefactisthathehasntyetrecoverfromillness.Thereasonwhyhehastogoisthathismotherisillinbed.,既不充当成分没有意义,比较在定语从句中的用法。TherearesomefilmsthatIdliketosee.SheistheonlyoneamongusthatknowsFrench.结论:that在引导定语从句时,指事物,也可指人,在从句中作主语或宾语,作宾语时常可省略。,.,一些引导词的用法（二）,What在表语从句中充当表示.1.Thequestioniswhatcausedtheaccident.2.Thatmountainisnolongerwhatitusedtobe.3.Whathetoldyouwaswhathadbeendiscussedatthemeeting.,主语、宾语或表语,什么，什么样子，或所的（人或事）,另：what不引导定语从句,.,一些引导词的用法（三）,Which在引导表语从句时,常充当_表示。如：Ireadaboutitinsomebookoranother,butwhatIdontknowiswhich(book)itis.,比较在定语从句中的用法。Chinaisacountrywhichhasahistoryof2000years.Adictionaryisabookwhichgivesthemeaningofwords.,定语,表语,其中哪一个,结论:which在引导定语从句时,指事物,在从句中作主语或宾语,作宾语时常可省略,.,一些引导词的用法（五）,whether在表语从句中表,但不充当句子的成分。if引导表语从句.如:Whatthedoctorreallydoubtsiswhethermymotherwillrecoverfromtheseriousdiseasesoon,“是否”,不能,.,LiLeiisnowinanewjacket.HelooksasifhewereanAmericanboy.Thegirlisgivingusavividdescriptionofthemoon.Itseemsasifshehadbeentothemoonmanytimes.Itlooksasifitmightrain.Thecloudsaregathering.itlooksasifitisgoingtorain.,一些引导词的用法（六）,由asif,asthough引导表语从句时要注意语态.若从句表示与现在事实相反,谓动用,与过去事实相反用或表示将来的可能性不大，则