主语从句主语从句的格式

主语从句(SubjectClause) 定义:如果一个句子在复合句中充当一个主语,那么这个句子就是主语从句. 第一部分:常规主语从句,即句子在复合句中充当一个主语 (1)Thathefinishedwritingthecompositioninsuchashorttimesurprisedusall. (2)Whetherwewillgoforanoutingtomorrowremainsunknown. (3)Whowillbeourmonitorhasn'tbeendecidedyet. (4)Whomwemuststudyforisaquestionofgreatimportance. (5)Whatcausedtheaccidentremainsunknown. (6)Whateveryoudidisright. (7)Whosewatchwaslostisunknown. (8)Whatweneedistime. (9)Whatweneedaregooddoctors. 小结: (1)引导主语从句连词有that,whether,who,what,whatever等 (2)连词位于句首不能省略 (3)主语从句大多数情况下视为三单,但也有例外,如例9 第二部分:为了防止句子头重脚轻,通常把形式主语it放在主语位置,真正主语搁置于句末 (1)Itiscertainthathewillwinthematch. (2)Itistruethathehasmadeaveryimportantdiscoveryinchemistry. (3)Itisverylikelythattheywillholdameeting. (4)Itisstrangethatheshoulddothat. (5)Itisimportantthatweallshouldattendthemeeting. (6)Itisstrangethatthemanshouldhavestucktohissillyideas. (7)Itisapitythatwewon'tbeabletogotothesouthtospendoursummervacation. (8)Itisstillamysterywhatcausedtheaccident. (9)Itissaidthathehasgonetoshanghai.(=Heissaidtohavegonetoshanghai) (10)ItisknowntoallthatthegunpowderwasfirstinventedbytheChinese. (11)Itissuggestedthattheworkshouldbedonewithgreatcare. (12)Itseemsthathehasseenthefilm.(=Heseemstohaveseenthefilm) (13)Ithappenedthatthetwocheatswerethere.(=Thetwocheatshappenedtobethere) 小结: (1)以that引出的主语从句,常以形式主语it引导.Itis+形容词/名词/某些动词ed+that从句. (2)在有些that从句中要用虚拟语气(should+do/should+havedone)例句4,5,6,11. 主语从句与宾语从句两者的用法和在句中的作用是不同的,下面从它们的各自用法,介绍:)~ 一.主语从句 主语从句定义:在句子中担当主语的是一个从句,这个从句就叫做主语从句。 主语从句是在复合句中充当主语的从句,通常放在主句谓语动词之前或由形式主语it代替,而本身放在句子末尾。 1.It作形式主语和it引导强调句的比较 It作形式主语代替主语从句,主要是为了平衡句子结构,主语从句的连接词没有变化。而it引导的强调句则是对句子某一部分进行强调,无论强调的是什么成分,都可用连词that。被强调部分指人是也可用who/whom。例如: Itisapitythatyoudidn’tgotoseethefilm. 2.用it作形式主语的结构 (1)Itis+名词+从句 Itisafactthat…事实是… Itisanhonorthat…非常荣幸 Itiscommonknowledgethat…是常识 (2)itis+形容词+从句 Itisnaturalthat…很自然… Itisstrangethat…奇怪的是… (3)itis+不及物动词+从句 Itseemsthat…似乎… Ithappenedthat…碰巧… (4)it+过去分词+从句 Itisreportedthat…据报道… Ithasbeenprovedthat…已证实… 3.主语从句不可位于句首的五种情况 (1)if引导的主语从句不可居于复合句句首。 (2)Itissaid,(reported)…结构中的主语从句不可提前。例如: ItissaidthatPresidentJingowillvisitourschoolnextweek. (3)Ithappens…,Itoccurs…结构中的主语从句不可提前。例如: Itoccurredtohimthathefailedintheexamination. (4)Itdoesn’tmatterhow/whether…结构中的主语从句不可提前。例如: Itdoesn’tmatterwhetherheiswrongornot. (5)含主语从句的复合句是疑问句时,主语从句不可提前。例如: Isitlikelythatitwillrainintheevening? 4.What与that在引导主语从句时的区别 What引导主语从句时在句时在从句中充当句子成分,如主语.宾语.表语,而that则不然。例如: Whatyousaidyesterdayisright. 二:宾语从句的几个特征:1、引导词:what\which\whose\when\whether\if\where 2语序:宾语从句必须是用陈述语句。 如:Ithinkthatyoumustworkharder. 宾语从句的引导词、连接词的区别、否定转移等现象。 (1)表达时间的几个句型:一般用when或者是whattime: Whattimewillthetrainleave? 由于时刻都是固定的,也可以用一般现在时代替一般将来时: Whattimedoesthetrainleave? (2)时间的表达方式:8:19(nineteenpasteight),7:57(threetoeight),在时间的中间也可以加上分的单词(minutes) (3)hadbetter+动词原型。意思是提要求,建议。但是上下级不能用这种方式,因为语气太重: Youhadbettergiveupsmoking. (4)sbleavesth+地点 Ileftmybookinmyclassroomyesterday. (5)mayIhaveyourname(address\age)?一般询问对方的年龄、名字等,不要习惯以前的问法,这样很不礼貌,而是要采访上面的问法。以前的习惯是:howoldareyou?\what'syourname? (6)修饰名词的代词次序:限-描-大-形---年---颜----籍----物--------类+名词: thisisabridge. Thisisabeautifulbridge 补充:从句的语序永远是陈述句。

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