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1、名词性从句在句子中起名词作用的句子叫名词性从句.1宾语从句；2主语从句；3表语从句；4同位语从句主语从句在另外一个句子中做主语的句子叫主语从句。Howthebookwillselldependsonitsauthor.Thatheisthebeststudentintheclassisobvious主语从句常用it作形式主语放句首因而我们常见到这种句式：It+be+n./adj/-ed从句（that,whether,etc.)例：It'sapitythatyoushouldhavetoleave.=Thatyoushouldh
2、avetoleaveisapity.ItisgreatthatIhaveateacherlikeyou.=ThatIhaveateacherlikeyouisgreat.Ⅲ.主语从句的连接词一、主语从句连词that(无词义,不作成分,不能省略);whether(是否),if不能位于句首。Thathewillcomeandhelpusiscertain.Whetherwewillsucceedisstillaquestion.Itisnotknownifhewillcome.注意:已确定的事由that引导;没决定的事由wheth
3、er引导.3.连接副词when,where，why,how,howlong,howoften,howsoon,howfar,howmany/much等.Whenthetestwillbegivenisnotyetdecided.Howmuchwecanspendmustbeagreedon.2.连接代词what,whatever,who,whoever,whose,which,whichever等.Whatheishasnothingtodowithyou.Whoseticketthisishasnotbeenfoundout
4、.特殊句式1.Ihate____ whenpeopletalkwiththeirmouthsfull．（MET98）A.it B.thatC.theseD.them2.Ifeel____strangethatheshouldbesocareless.A./B.itC.thatD.how3.Itworriedherabit ____herhairwasturninggrey.（MET92）A．whileB.thatC．if D．for为了使句子保持平衡，常用it来代替主语从句或宾语从句，而把主语从句或宾语从句放到后面，尤其是连词
5、that引导的主语从句常用于此种句式中，但what，whatever，whoever，whichever引导的主语从句一般不后置。请你归纳 ？同位语从句在一个更长的句子中作同位语使用的句子叫同位语从句。同位语与其前的词或短语表达的是同一事物。如：Thefactthatsheisillshouldbeconsidered.Thenewsthatourteamhaswonthematchistrue.Hisdelayisduetothefactthatthecarwentwronghalfway.同位语从句同位语从句一般跟在名词f
6、act,news,promise,truth,belief,thought,idea,answer,information,doubt,knowledge,hope,law,opinion,plan,suggestion后面,用以说明或解释前面的名词.TheDifferencesBetweenAppositiveclausesandAttributiveClauses怎样区别同位语从句与定语从句同位语从句与定语从句的不同之处1、从句的作用不同：同位语从句用来进一步说明前面名词的内容；定语从句用来修饰、限定前面的名词。e.g.T
7、henewsthatourteamhaswonthefinalmatchisencouraging.（从句说明“消息”的内容：我们队取得了决赛胜利。）Thenewsthatyoutoldusisreallyencouraging.（从句对“消息”加以限定：是你告诉我们的，而非来自其他渠道。但消息是何内容却不得而知。）2、引导从句的关联词that的功能不同：that引导同位语从句时是一个纯连词，不充当任何成分；而引导定语从句的that是关系代词，既指代先行词又须在从句中充当成分。e.g.1)Dadmadeapromisethat
8、hewouldbuymeCDplayerifIpassedtheEnglishtest.（that不充当任何成分）2)Dadmadeapromisethatexcitedallhischildren.（that指代promise，又在从句中充当主语。）高一英语语法同步辅导3、
