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1、表语从句与同位语从句作表语的从句即为表语从句句型为系动词+连词或关系代词+从句一.thatthetruthisthathedoesn'treallytry.theproblemisthatihavelostmyjob.表语从句中的that一般不省略，口语及非正式问题中有时也省略。二。whetherthequestioniswhetherthequetionisworthseeing.表语从句中不用if，但可以用asif三。连接代词引导（who、whom、which）youarenotwhoith
2、oughtyouwerethequestioniswhomweshouldtrustwhatiwantotknowiswhichroadweshouldtake.四.连接副词引导（how、where、why、when）theproblemishowwecanfindhimthatwaswheniwas15that'swhereifirstmetherthat'swhyiobjecttothisplanthat'swhereyouareworng五.关系代词whatthat'swhatiwantt
3、osay.fameandpersonalgainiswhattheyareafterheisnolongerwhathewas六。asif/asthoughitisn'tasifyouweregoingawayforeveritwasasthoughshehadknownlucyforyearsit'snotasthoughwewerepoor.七.becauseit'sbecauseiloveyoutoomuchbecause引导表语从句，但since，as，for等不用于引导表语从句同位语从
4、句在主从复合句中作同位语的从句称为同位语从句。同位语从句一般用that,whether，what,which,who,when,where,why,how等词引导，常放在fact,news,idea,truth,hope,problem,information,wish,promise,answer,evidence,report,explanation,suggestion,conclusion等抽象名词后面1.如同位语从句意义完整，应用that引导同位语从句。（即that不充当任何成分，只起
5、连接作用，不可省略）Thegeneralgavetheorderthatthesoldiersshouldcrosstheriveratonce.2.如同位语从句意义不完整，需增加"是否"的含义，应用whether引导同位语从句。（if不能引导同位语从句）We'lldiscusstheproblemwhetherthesportsmeetingwillbeheldontime3.如同位语从句意义不完整，需增加"什么时候"、"什么地点"、"什么方式"等含义，应用when,where,how等词引导
6、同位语从句。IhavenoideawhenhewillbebackIhavenoimpressionhowhewenthome,perhapsbybike4.当主句的谓语较短，而同位语从句较长时，同位语从句常后置。Thethoughtcametohimthatmaybetheenemyhadfledthecity把握同位语从句和定语从句的区别，明确同位语从句和相似从句的界限同位语从句和定语从句相似，都放在某一名词或代词后面，但同位语从句不同于定语从句。同位语从句对名词加以补充说明，是名词全部内容
7、的体现，且名词和同位语从句的引导词均不在从句中作成分；定语从句说明先行词的性质与特征，与先行词是修饰与被修饰的关系，且名词和定语从句的引导词均在从句中作成分。1）Informationhasbeenputforward____moremiddleschoolgraduateswillbeadmittedintouniversities.A.whileB.thatC.whenD.as析：答案为B。moremiddleschoolgraduateswillbeadmittedintouniversi
8、ties是Information的全部内容，且Information不在从句中作成分，所以该句为同位语从句。应将该句区别于：2）Itissaidthatmoremiddleschoolgraduateswillbeadmittedintouniversities，thisistheinformation____hasbeenputforward.A.whatB.thatC.whenD.as析：答案为B。thathasbeenputforward为information的修饰性定语，且inform
