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1、名词性从句带有从句的复合句就是用连接词把主句和从句连接在一起。高中英语中共有三大从句：一、形容词性从句（即定语从句）；二、名词性从句；三、状语从句。形容词性从句即定语从句，相当于一个形容词，作先行词的定语，用来修饰前面的名词或代词的。名词性从句相当于名词，可分别作主句的主语、表语、宾语和同位语。因此，名词性从句分为主语从句、表语从句、宾语从句和同位从句。主语从句、表语从句、宾语从句只有在主句句子的成分残缺时才可以考虑使用这三大从句。同位语则是对前面某一名词的展开，即对前一名词的具体说明，做进一步解释，两者是同等，并不是定语从句的修饰与被修饰关系。名词性从句考得最多的是宾语从句，其次是主语从句，
2、再次是表语从句，而同位语从句则很少考查。（一）主语从句第一部分：常规主语从句，即从句在复合句中充当一个主语。主语从句的时态：不受主句时态的影响和限制。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。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。注意：(1)引导主语从句连词有that,whether,who,w
3、hat,whatever等；(2)连词位于句首不能省略；(3)主语从句后的谓语动词一般用单数形式。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，真正主语置于句末。从句用that引导。常用句型如下：It + be + 名词 + that从句It is a pity that we wont be able to go to the south to spend our summer vacation.It is still a mystery what caused the accident.It + be + 形容词 + that从句It is certain that he
4、 will win the match.It is very likely that they will hold a meeting.It + be + 动词的过去分词 + that从句It is said that he has gone to shanghai.(=He is said to have gone to shanghai)It is known to all that the gun powder was first invented by the Chinese.It + 不及物动词 + that 从句It seems that he has seen the film.
5、(=He seems to have seen the film)It happened that the two cheats were there. (=The two cheats happened to be there)【注意】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。It is necessary (important, natural, strange, etc.) that 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) do。It is suggested (requested,
6、proposed, desired, etc.) thate.g. It is strange that he should do that.It is important that we all should attend the meeting.It is suggested that the work should be done with great care.（二）表语从句引导表语从句的关联词与引导主语从句的关联词大致一样，表语从句位于连系动词后。The problem is how we can get the things we need.问题是我们怎样能弄到我们需要的东西。(h
7、ow充当方式状语)The scissors are not what I need. 这把剪刀不是我所需要的。(what 在表语从句中充当宾语)What I told him was that I would find him a good play. 我告诉他的是我会给他找个好剧本。(what在主语从句中作直接宾语， that作为表语从句的引导词在该表语从句中不充当句子成分， 不能省略) That is what I want to tell you.那就是我想要对你讲的。(what在表语从句中充当直接宾语) This is where our problem lies. 这就是我们的问题所
8、在。It looks as if it is going to rain. 看上去天要下雨了。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。That is why she failed to pass the exam. 那就是她考试不及格的原因。(why 在表语从句中充当原因状语)“That is why.”是常用句型， 意为“这就是的原因/因此”， 其中why引导的名词性从句在句中作表语， 该句型通常用于针对前面已经说明过的原因进行总结， 又如： That is why I came. 这就是我来的原因。
9、下面是两个与“That is why.”形式相似的结构， 它们与“That is why.”结构之间的关系要能够辨析清楚： (1)“That is why.”与“That is the reason why.”同义， 只不过从语法结构上讲， “That is the reason why.”中why引导的是个定语从句， 将其中的the reason去掉则与“That is why.”结构一样， 例如： That is (the reason) why I cannot agree. 这就是我不能同意的理由。(2)“That is because.”句型中从属连词because引导的名词性从句在
10、此作表语， 这也是个常用句型， 意为“这就是为什么/因为”。“That is because.”与“That is why.”之间的不同，在于“That is because.”指原因或理由， “That is why.”则指由于各种原因所造成的后果， 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)He had seen the f
11、ilm 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)需要注意的，当主语是reason时，表语从句要用that引导而不是because。The reason why he was late was that he missed the train by one minute this morning .【注意】whether 可引导表语从句，但与之同义的if却不能引导引导表语从句。as if 则可以。不像宾语从句，在有的表语从句复合句中，主句时态和从句时态
12、可以不一致。 The question is who will travel with me to Beijing tomorrow.The question is why he cried yesterday.关于连系动词：系动词亦称连系动词（Link Verb），作为系动词，它本身有词义，但不能单独用作谓语，后边必须跟表语（亦称补语），构成系表结构说明主语的状况、性质、特征等情况。连系动词分6种(1) 状态系动词：只有be一词。如：She is always like that. 她总是那样。(2) 持续系动词：表示主语继续或保持一种状况或态度，主要有keep, remain, stay,
13、 rest,lie, stand。如：I hope youll keep fit. 我希望你身体好。(3) 表像系动词：表示“看起来好像”，主要有seem, appear, look等。如：He looks tired. 他看起来很累。He seems (to be) quite happy. 他好像很快活。(4) 感官系动词：表示“起来”，有feel(摸起来，感觉) , smell(闻起来) , sound(听起来) , taste(尝起来，吃起来) 等。This kind of cloth feels very soft. 这种布摸起来很软。Everybody feels contente
14、d. 每个人都感到很满足。(5) 变化系动词：表示主语变成什么样，主要有become, grow, turn, fall, get, go, come, runHe became mad after that. 自那之后，他疯了。His cold was growing worse. 他的感冒越来越严重了。Shes growing fat. 她正在发胖。When she saw this, she turned red. 她看到这，脸红了。His hair turned grey in a few weeks. 在几个星期中他头发就变灰白了。The milk will soon turn so
15、ur. 牛奶很快就会变酸。We get wiser as we get old. 随着年岁的增长，我们也变得聪明些了。Your hair has gone quite white! 你的头发全白了!When I mentioned it to him he went red. 我对他提及此事时他脸红了。He went mad. 他疯了The children must not go hungry. 孩子们不能挨饿。(6) 终止系动词：表示主语已终止动作，主要有prove, turn out(结果是，证明是) 等。如：His story proved false. 他讲的情况原来是假的。My intuition turned out to be correct. 我的直觉证明是对的。（turn out表终止性结果）（三）宾语从句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。一、3种宾语从句：1.动词的宾语从句(1)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.(2)部分“动词+副词”结构也可以带宾语
