Unit17 名词性从句-薄冰实用英语语法详解

Um(17 名词性从句 17->(名词性从句概述 在句子中起名词作用的从句叫作名词性从句( the noun clause)。根据它们在句中所 充当的成分不同,名词性从句又可分为主语从句、表语从句、宾语从句和同位语从句四 17(2主语从句 主语从句( the Subject clause)在复合句中用作主语,它的位置与陈述句基本结构 中的主语相同。引导主语从句的关联词有从属连词、连接代词和连接副词等。 ∏由从属连词引导 引导主语从句的从属连词主要有that, whether和i等。如 That mathematics is one of the most useful and fascinating divisions in human knowledge is widely accepted 数学是人类知识中最有用和最令人着迷的部分之一,这一点得到了广泛的认可。 Whether it will do us harm or good remains to be seen 这事会对我们有害还是有益,还要等等看。 2由连接代词引导 ①引导主语从句的连接代词有who,what和 which。如: Who did the work is unknown.这件工作是谁干的,大家都不知道。 whom we should serve is an important question 我们应当为谁服务是个重要问题。 What you said is quite true.(what= that which,是连接代词 你所说的话是正确的。 318 B BING GRAMMAR akes the school proud was more than 90% of the students had been admitted to key universities (高考上海卷题 A What because B. That wh C. What that D. That because 【答案选C】what引导主语从句,除了起连接作用外,还在从句中担任主语;that引导表语从句 用来表示某一事实,也能表示某人的观点、意见、要求和希望等,通常不能省略 ② whatever, whoever和 whichever等复合连接代词也可引导主语从句。如 Whatever she did was right.她所做的无论什么事情都是对的。 Whoever does best will get the prizes.谁干得最出色谁就得奖。 Whichever day you come is welcome.欢迎你随时来。 3由连接副词引导 名词性 ◎引导主语从句的连接副词有when, where,why,how等。如 How ballads were composed has been a subject of debate among scholars 民歌是如何创作的,这一直是学者们争论的一个问题。 When he left is unknown.他什么时候离开的还不知道。 Where we shall do the test is still under discussion 我们在什么地方做这个实验还在讨论。 Why the sun in the morning looks bigger than the sun at noon is very interesting 为什么早晨的太阳看上去比中午的太阳大,这事很有趣 ② wherever, whenever和 whichever等复合连接副词也可引导主语从句。如 However you did it is all right with me.无论你怎样做这件事对我来说都行 4作形式主语 ①“It+be+名词+主语从句”中从句谓语动词常用“( should+)动词原形(或完成 式)”,常用于本结构的名词有:apiy, a shame, no wonder等。如 It is a great pity that he should be so greedy.真遗憾,他竟然那么贪婪。 It is a shame that he should attempt to injure the reputation of an honest man 他试图伤害一个老实人的名誉,那是可耻的 It was no accident that such a book should appear in the 18th century 此书于18世纪问世绝非偶然。 ②“It+be+形容词+主语从句”中从句谓语动词常用“( should+)动词原形(或完 成式)”,常用于本结构的形容词有: strange, impossibl