高中一年级英语必修1课件.ppt

表语从句的定义：在复合句中作表语的从句叫做表语从句。表语从句对主语进行解释、说明，使主语的内容具体化。结构是“主语+系动词+表语从句”。可以接表语从句的系动词有be,look,remain,seem等。Eg.Thatiswhyhedidin’tcome.1.Thequestioniswhetherwecanrelyonhim.2.That’sbecausewewereinneedofmoneyatthattime.3.Helookedasifhewasgoingtocry.4.That’swhyIwaslate.引导词的用法（一）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:1.Whatthedoctorreallydoubtsiswhethermymotherwillrecoverfromtheseriousdiseasesoon.2.Thequestioniswhetheritisworthdoing.what在表语从句中充当______________表示____________________________.1.Thequestioniswhatcausedtheaccident.2.Thatmountainisnolongerwhatitusedtobe.3.Whathetoldyouwaswhathadbeendiscussedatthemeeting.who在表语从句中充当______________表示____.Theproblemiswhocoulddothework2.Mytroubleiswho(whom)Icanturnto.which在引导表语从句时,常充当_____________表示。如：Ireadaboutitinsomebookoranother,butwhatIdon’tknowiswhich(book)itis.由asif,asthough引导表语从句，表示好像。句子中的系动词常用look,appear,seem等。Itlooksasifitwasdoingtorain.2.Theyoungmanwithlonghairlooksasifhewereagirl.当主句的主语为reason,或者是由why引导的从句时,与它们相关的表语从句用_________,而不能由_______引导;because引导表语从句时只能用于________________________句型中.1.ThereasonwhyIwaslatewasthatImissedthetrain.2.Iwaslate.It/That/ThiswasbecauseImissedthetrain.当表语从句中主语、宾语、表语具备，但是还是要表示疑问含义，可以判断句子中缺少状语，常常用相应的特殊疑问词引导，有why,when,where,how等Thisishowhedidit.Thatiswhythebrotherswantedtomakeabet.That’swhywe’vegivenyoutheletter.表语从句引导词注意事项1.That’s___thePartycalledonustodo.A.whyB.whatC.howD.that2.Thereasonis___heisunabletooperatethemachine.A.becauseB.whyC.thatD.Whether3.Thatis___theyseparated.A.thatB.whatC.whichD.where4.Janeisnolonger___shewasfouryearsago.A.whatB.whichC.thatD.when名词主语+be+that引起的表语从句