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高中英语语法之名词性从句在句子中起名词作用的句子叫名词性从句 (Noun Clauses）。 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，因此根据它在句中不同的语法功能，名词性从句又可分别称为主语从句、宾语从句、表语从句和同位语从句。二. 主语从句1、作句子主语的从句叫主语从句。主语从句通常由从属连词that，whether，if和连接代词what，who，which，whatever，whoever以及连接副词how，when，where，why等词引导。that在句中无词义，只起连接作用；连接代词和连接副词在句中既保留自己的疑问含义、又起连接作用，在从句中充当从句的成分。例如：What he wants to tell us is not clear. 他要跟我们说什么，还不清楚。Who will win the match is still unknown. 谁能赢得这场比赛还不得而知。It is known to us how he became a writer. 我们都知道他是如何成为一名作家的。Where the English evening will be held has not yet been announced. 英语晚会将在哪里举行，还没有宣布。另注意在主语从句中用来表示惊奇、不相信、惋惜、理应如此等语气时，谓语动词要用虚拟语气“(should) +do”，常用的句型有：It is necessary (important, natural, strange, etc.) that It is suggested (requested, proposed, desired, etc.) that2、第一部分：常规主语从句，即句子在复合句中充当一个主语主语从句的时态：不受主句的时态影响和限制。（1）That he finished writing the composition in such a short time surprised us all.（2）Whether we will go for an outing tomorrow remains unknown.（3）Who will be our monitor hasnt been decided yet.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）It is certain that he will win the match.小结:（1)以that 引出的主语从句,常以形式主语it引导. It is +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+have done)例句4,5,6,11.3、主语从句的用法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。 用it 作形式主语的结构 (1) It is 名词从句 It is a fact that 事实是 It is an honor that 非常荣幸 It is common knowledge that 是常识 (2) it is 形容词从句 It is natural that 很自然 It is strange that 奇怪的是 (3) it 不及物动词从句 It seems that 似乎 It happened that 碰巧 (4) it is过去分词从句 It is reported that 据报道 It has been proved that 已证实 4. What 与that 在引导主语从句时的区别 What 引导主语从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： What you said yesterday is right. 三、宾语从句名词句用作宾语的从句叫宾语从句。引导宾语从句的关联词与引导主语从句表语从句的关联词大致一样，在句中可以作谓语动词或介词及非谓语动词的宾语。1.宾语从句的连接词从属连词：连接宾语从句的从属连词主要有that,if,whether.that引导表示陈述句的宾语从句,而if和whether引导表示“是否”的宾语从句.He told me that he would go to the college the next year他告诉我他明年上大学.I dont know if there will be a bus any more.我不知道是否还会有公交车.Nobody knew whether he could pass the exam.没人知道他是否会通过考试.连接代词：连接代词主要有who, whom ,whose ,what ,whoever ,whomever ,whosever, whatever, whichever等.连接代词一般指疑问,但what, whatever除了指疑问外,也可以指陈述.Do you know who has won Red Alert game? 你知道是谁赢得了红色警报的游戏？The book will show you what the best CEOs should know. 这本书会告诉你最好的执行总裁该了解些什么.Have you determined whichever you should buy,a Motorola or Nokia cell phone?你决定好是买诺基亚还是摩托罗拉的电话了吗?连接副词：连接副词主要有when,where,why,how,whenever,wherever,however等.He didnt tell me when we should meet again.他没有告诉我什么时候我们能再见面.Could you please tell me how you use the new panel?你能告诉我怎么用这个新的操作盘吗?None of us knows where these new parts can be bought.没有人知道这些的新的零件能在哪里买到.2. 由连接词that引导的宾语从句由连接词that引导宾语从句时，that在句中不担任任何成分，在口语或非正式的文体中常被省去，但如从句是并列句时,第二个分句前的that不可省。例如：He has told me that he will go to Shanghai tomorrow. 他已经告诉我他明天要去上海。注意：在demand、order、suggest、decide、insist, desire, request, command等表示要求、命令、建议、决定等意义的动词后，宾语从句常用“（should）+ 动词原形”。例如：I insist that she (should) do her work alone. 我坚持要她自己工作。3. 用who，whom, which, whose, what, when, where, why, how, whoever, whatever, whichever等关联词引导的宾语从句应注意句子语序要用陈述语序。例如：I want to know what he has told you. 我想知道他告诉了你什么。 3. 用whether或if引导的宾语从句，其主语和谓语的顺序也不能颠倒，仍保持陈述句语序。此外，whether与if 在作“是否”的意思讲时在下列情况下一般只能用whether，不用if：a. 引导主语从句并在句首时；b. 引导表语从句时；c . 引导从句作介词宾语时；d. 从句后有“or not”时；e. 后接动词不定式时。例如：Whether there is life on the moon is an interesting question. 月球上有没有生命是个有趣的问题。 The question is whether she should have a low opinion of the test?现在的问题是她是否应该有一个低意见的测试？ Everything depends on whether we have enough money. 一切要看我们是否有足够的钱。 I wonder whether he will come or not. 我想知道他来还是不来。 Can you tell me whether to go or to stay? 你能否告诉我是去还是留？4. .宾语从句的时态和语序当主句为现在时或将来时,宾语从句的时态一般不受主句的时态所影响.当主句为过去时从句用一般过去时或过去进行时表示与主句谓语动词动作同时发生I only knew he was studying in a western country,but I didnt know what country he was in.我只知道他当时在西方的一个国家读书,可不知道是哪个国家.He asked me if I was reading the story The Old Man and the Sea when he was in.他问我他进来的时候我是否正在读.从句过去完成时表示该动作发生在主句谓语动作之前He told me that he had told Mary about the meeting already.他告诉我他已经把有关会议的事情告诉的了Mary.从句谓语用过去将来时表示该动作发生在主句谓语动作之后The reporter asked if the government would take necessary measures to put down the to-do.记者问政府是否会采取必要的措施镇压骚乱.如果从句是一个客观真理,那么从句的时态不根据主句的时态而变化The teacher said that the moon goes around the earth yesterday.老师昨天说月亮绕着地球转.当宾语从句的引导词是who,which,what,when,where,how,why等表疑问时,不能按正常语序安排,经常将这类引导词置于句首Who do you think the public might choose as their favorite singer this year?你认为今年公众会选谁为他们最喜欢的歌手. 5.动词的宾语从句大多数动词都可以带宾语从句We all expect that they will win , for members of their team are stronger.我们都预料他们会赢,因为他们的队员更强壮.He told us that they would help us though the whole work.他告诉我们在整个工作中,他都会帮忙的. 动词短语也可以带宾语从句常见的这些词有:make sure确保 make up ones mind下决心 keep in mind牢记Make sure that there are no mistakes in your papers before you turn them in.在上交试卷前确保没有任何错误.6.宾语从句的否定转移主句的谓语动词是think,believe,imagine,suppose,consider,espect,fancy,guess等,并且主句的主语是第一人称而且为一般现在时,从句的否定词一般要转移到主句上来,其反义疑问句一般与宾语从句一致.I dont think he will come to my party.而不能说成I think he wont come to my party.我认为他不会来我的舞会.I dont believe that man is killed by Jim,is he?我认为那个人不是Jim所杀的,是不是?如果宾语从句中有某个含有否定意义的形容词或副词,其反义疑问句要用肯定形式.We find that he never listens to the teacher carefully,does he?我们发现他从来不仔细听老师讲课,是不是?四、表语从句1、表语从句就是用一个句子作为表语。说明主语是什么或者怎么样，和连系动词一起构成谓语。其基本结构为：主语 + 系动词 + 从句。例如：定义：A The problem is puzzling. 这问题令人困惑主语 连系动词 形容词作表语The problem is when we can get a pay rise. 问题是什么时候我们可以得到加薪.主语 连系动词 一个句子作表语-表语从句2、 连接表语从句的连接词有：that, what, who, when, where, which, why, whether,how, 有时用as if引导。He has become what he wanted to be ten years ago. 他已经成为了他10年前想成为的。She has remained where I stood yesterday for an hour.她一直在我昨天站的地方站了一个小时。His suggestion is that we should stay calm. 他的建议是，我们应该保持冷静。The question is when he can arrive at the hotel. 问题是，他什么时候可以到达酒店。 who will travel with me to Beijing tomorrow.谁与我明天将前往北京。 how I can persuade her to join us in the party. 我怎么能说服她加入我们的派对。 whether the enemy is marching towards us. 是否敌人正向我们行进.It looks as if it is going to rain. 看上去天要下雨了。【注意】1.当主语是reason时，表语从句要用that引导而不是because。例如：The reason was that he was lazy.2.whether 可引导表语从句，但与之同义的if却通常不用于引导表语从句(as if 例外）引导宾语从句时可以互换if/whether 位于介词后要用whether 位于句首时要用whether 引导表语从句，主语从句，同位语从句时要用whetherFalse: The question is if the enemy is marching towards us.Right: The question is whether the enemy is marching towards us.Right: It looked as if he had understood this question.3. 表语从句一定要用陈述语序。False: The question is when can he arrive at the hotel.Right: The question is when he can arrive at the hotel.4. that在表语从句中不可以省掉。5.表语从句只能置于主句之后，而主句的动词只能是联系动词。6. “That is why.”与“That is because.”结构区分 (1) “That is because.”指原因或理由，例如： He did not see the film last night. That is because he had to help his little sister with her homework.昨天晚上他没有去看电影， 那是因为他得帮助他的妹妹做作业。(第一句话说明结果， 第二句话说明原因) (2) “That is why.”则指由于各种原因所造成的后果， He had seen the film before. That is why he did not see it last night.他以前曾看过那部电影， 因此他昨天晚上没有去看。(第一句话说明原因， 第二句话说明结果)五、同位语从句一、在复合句中用作同位语的从句叫同位语从句。它一般跟在某些名词后面，用以说明该名词表示的具体内容。如： I heard the news that our team had won我听到了我们队获胜的消息。 I had no idea that you were here我不知道你在这里。 二、可以跟同位语从句的名词通常有news，idea，fact，promise，question，doubt，thought，hope，message，suggestion，words（消息），possibility等。如： Ive come from Mr wang with a message that he wont be able to see you this afternoon 我从王先生那里来，他让我告诉你他今天下午不能来看你了。 三、英语中引导同位语从句的词通有连词 that，whether，连接副词 how,when,where等。（注：if,which 不能引导同位语从句。）如： l have no idea when he will be back我不知道他什么时候回来。 He must answer the question whether he agrees to it or not. 他必须回答他是否同意这样一个问题。 四、有时同位语从句可以不紧跟在说明的名词后面，而被别的词隔开。 如： Several years later，word came that Napoleon himself was coming to inspect them 几年以后，有消息传来说拿破仑要亲自视 察他们。 The thought came to him that maybe the enemy had fled the city 他突然想起可能敌人已经逃出城了。同位语从句和定语从句的区别： that作为关系代词，可以引导定语从句，充当句子成分，在从句中作宾语时可以省略； that引导同位语从句时，起连词的作用，没有实际意义，不充当句子成分，一般不能省略。 试比较下面两个例句: I had no idea that you were here（that引导同位语从句，不能省略）Have you got the idea（that）this book gives you of life in ancient Greece？（that引导定语从句，作宾语，可以省略）
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