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英语名词性从句知识点精讲小结精析概要 1．主语从句：主语从句在整个句子中作主语。 (1)不同于其它的连词，它不充当句子的成分，只是单纯的连接词，通常不可以省略。分句置于句首时，that绝对不可以省略。 That the driver could not control his war was obvious. It was obvious that the driver could not control his car. (2)if 不能用在主语从句中，而是用whether Whether he left (or not) is unknown (3)当主语从句作主语时，谓语动词一般用第三人称单数，下面这个句型例外。 What we need is more time and money. What we need are many more books. 人教高中英语单词mp3 人教版高中英语单词 人教版初中英语mp3 2.表语从句：表语从句出现在系动词后，充当表语。 The trouble is that we are short of money. Go and get y our coat. It’s where you left it. (1) 引导表语从句除了上述三类词外还有because, as if/ as though等等 The reason (why/for which…..) is that …… It/This/That is because…… (2) 连系动词“appear, look, seem”的两个常用句型 It seems/appears that…. It looks/ seems as if/as though……(与事实相符用陈述语气，与事实相反用虚拟语气) (3) as 也可以引导表语从句 Things are not always as they seem to be 3．当名词性从句缺少主语、宾语 或表语时，引导词通常用what，它相当于。 另外，有时具有感叹意义all that, anything that或 the thing(s) that。 What we can’t get seems better than what we have. Tom thought what a beautiful girl Mary was. 4.注意区分it 作形式主语的主语从 句与强调句。 强调句句型It is/was+被强调部分+that, 去掉It is/was, that，句子仍然成立。 It is natural that they should have different views. 主语从句 It is only lately that he had had a family himself. 强调句 What was it that he wanted? I don’t know what i t was that he wanted. It was in the hotel where he stayed that we discussed the serious problem 5.注意it 作形式主语的主语从句和as引导非限制性定语从句引导的不同。 It is known to all that the earth is round. As is known to all, the earth is round 题一： , she was very brave. A. As she was a girl B. A girl as she was C. Girl as was she D. Girl as she was 题二： , she is quite experienced in the work. A. As is she young B. As young she is C. Young as she is D. Young although she is 题三： The rest of the novel ______ very interesting. A. seem B. is C. are D. were 题四： Most of what has been said about the Smiths ______ also true of the Johnsons. A. are B. is C. being D. to be 题五： The company had about 20 notebook computers but only one-third ______ used regularly. Now we have 60 working all day long. A. is B. are C. was D. were 题一： D 详解：as在这里引导让步从句。as引导让步从句时，必须将表语、状语或实义动词提到句首，构成“形容词/副词/名词/动词/分词+as+主语+谓语的其它部分”的倒装形式。注意：在这个结构中，作表语的单数可数名词前的冠词要省去。在此题中，单数可数名词girl作表语要提到句首，并且省略a。 题二： C 详解：根据句意，as在这里引导让步从句。as引导让步从句时，必须将表语、状语或实义动词提到句首，构成“形容词/副词/名词/动词/分词+as+主语+谓语的其它部分”的形式；althoug引导让步从句时，从句不倒装。在此题中，从句的结构为主系表，即she is young。如果用as, 就应为young as she is；如果用although, 就应为although she is young。 题三： B 详解：分数或百分数及all, part, some, most, half, the rest of等表示部分的词或短语作主语时，谓语动词的单复数要与of后的名词一致。the rest of 后面为novel, 所以谓语用作单数。 Half of the students 题四： B 详解：most指代what引导的从句，谓语动词用单数。 题五： D 详解：本题考查主谓一致及动词的时态。当分数、百分数作主语时，要根据其后面的名词来决定其谓语动词的单复数。此处one-third应是one-third of the notebook computers的省略形式，因此谓语动词用复数，且句子的时态用了过去时，所以D项正确。 
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