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时间:2019-08-29
《第一轮复习(语法)unit15名词性从句》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、第一轮语法复习一unit15名词性从句在句子中起名词作用的句子叫名词性从句。名词性从句的功能相当于名词词组,它在复合句中能担任主语、宾语、表语、同位语、介词宾语等•名词性从句包括:主语从句、表语从句、宾语从句和同位语从句。引导名词性从句的连词有:A.连词:that,whether,if(这三个词都不作从句的成分,同时,that无含义,而whether和if都表“是否”)B.疑问代词:who,whom,whose,what,whichC.疑问副词:when,where,why,how(一)主语从句在复合句中充当主语的从句。1.that引导主语从句that引
2、导主语从句时不同于其他的连词,既无词义也不作成分,只起单纯的连接作用,且通常不可以省。为了强调that引导的主语从句而置之于句首时,that不可省。①Thatthedrivercouldnotcontrolhiscarwasobvious.②Thatshewaschosenmadeusveryhappy.③Thathewillcomeiscertain.④Thathewouldtaketheriskistrue.★通常,that引导主语从句时用it做形式主语,把从句置于句尾,此时that有时可省。①Itwasobviousthatthedrivercou
3、ldnotcontrolhiscar>②Itmadeusveryhappythatshewaschosen.(3)Itiscertainthathewillcome.④Itistruethathewouldtaketherisk.★如果以that从句为主语的句子是疑问句,就只能用先行词it结构。例如:①Isitcertainthathewillcome?②Isittruethathewouldtaketherisk?▲it做形式主语有以下几种不同的结构:仃)It+be+形容词+that-从句①Itislikelythathewillcome.②Itiss
4、trangethatshehasevertrustedhim.③Itisimportantthathe(should)attendthemeeting.④Itisbestthathe(should)go.此句型在表示惊讶、喜悦、遗憾等感情色彩时,that从句中的谓语动词也常用(should)+v原形。Itisstrangethatnooneshouldhaveobjectedtotheplan.(2)It+be+名词+that-从句Itiscommonknowledgethatthewhaleisnotafish...It'sapitythathesho
5、uldhavemassedthetrain.(3)It+be+~ed分词+that从句Itissaidthatheisafamouswriter.Itisreportedthattherewillbeastormthisafternoon.▲在表示建议、要求、命令等意义的被动结构中,that从句中的谓语动词常用(should)doo(参见虚拟语气部分)Itissuggestedthatthemeeting(should)beheldthisafternoon.Itisdemandedthathe(should)leaveatonce.(4)It+seem
6、/happen/appear等不及物动词+that从句。(look不接that从句,它接tobe结构或形容词)Itseemsthatheiswrong.Itappearsthattheyareinurgentneedofhelp.Helooks(tobe)surprised/happy/sad.2.whether引导主语从句,意为“是否”,只起连接作用,不充当任何成分。(置于句首时必须用whether引导,置于句尾时,间或可用if。)Whetherhewillwinthegameisnotclear.Whetherhewillcomeisuncertai
7、n.Whethershecomesornotdoesn,tconcernme.Itisnotclearwhether/ifhewillcome.Itwasuncertainwhetherhewouldcome.3•连词代词what,who,which,whose等引导的主语从句。这些连接代词作用相当于代词,在从句中担当主语、宾语、表语、定语等。Whatweneedismoretime.Whowasresponsiblefortheaccidentisnotyetclear.Whosebookitisnotimportant.Whichschoolyouw
8、anttogomattersmuch.4.连接副词when,where,why,
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