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名词性从句思维导图
表一：主语从句
表一：主语从句
〔1〕由连词that引导主语从句。
That you will win the medal seems unxpected; believed; thought; hoped; noted; discussed; required; decided; suggested; demanded; made clear; found out,etc.
It is thought that he is the best player. 大家都认为他是最好选手。
It is used to be thought that a new star must be due to a collision between two stars. 过去一直认为新星是由于两颗星星之间碰撞产生。
It has not been made clear when the new road is to be opened to traffic. 还没弄清楚这条路将开场通车
It seems that … 好似是……
It happened that… 碰巧……
It follows that …
It turned out that nobody remembered the address.
结果是无人记得那个地址。
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〔4〕 It +不及物动词+从句
由此可见……
It has turned out that … 结果是……

类似不及物动词还有：seem, appear, occur, follow, happen, turn out, etc.
It now appears that they are in urgent need of help.
看起来他们急需帮助。
It does not matter if I missed my train, because there is another later.
没有赶上这趟火车没有关系，稍晚还有一趟。
〔当“及物动词 + 宾语〞较短时，也可用这种构造。〕
例如：It shocked me that Peter did not tell anybody where he was.
让我吃惊是彼得没有告诉任何人他在哪里。
It does not interest me whether you go or not.
我对你去不去不感兴趣。
It +某些固定构造+ 主语从句。
例如：It doesn’t make too much difference 〔It doesn’t make any difference / It doesn’t alter the situation〕，whether it rains or not . 下不下雨都没有多大关系。
It does not make any difference whether it rains or not . 下不下雨没什么分别。
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It does not make the least difference to me what you do. 对我来说你做什么都无关紧要。
Is it of much consequence to you that Mr. Wang has failed to do it 王先生没有做成这件事对你有什么重要影响吗？
3. 连接代词who, whom, whose, what, which，连接副词when, where, why, how，它们起连接作用，作句子成分，各有自己意义。
表二：宾语从句
一、宾语从句连接词
1. 连词that，只起连接作用，在从句中不作句子成分，也无词汇意义，在口语中常被省略。
eg. He knew 〔that〕 he should work hard.
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表二：宾语从句
表二：宾语从句
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2. 连词if 、whether，它们起连接作用，在从句中不作句子成分，作“是否〞解，在口语中多用if。
一般情况下，if 与whether可以互换，但以下3种情况只能用whether：
 
eg. Tom don't know if/whether hi