名词从句-主语从句的基本句型-it句型的特点

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主语从句  【标准地道的英语语法书，请到姐妹网站去搜索下载，https://domzh.com】
这里主要讨论陈述句和疑问句用作主语的情况。此外，英语里还可以用because引导的从句来充当句子主语，见后面的回帖。
that引导的主语从句
对于that引导的主语从句，我们要重点看其在句中的位置特点：它一般是置于句末的，偶尔也可以置于句 首。
由that引导的主语从句可以直接放在句首。请看例句：
1. That the seas are being overfished has been known for years.
重点提示： 这里that从句that the seas are being overfished即是一个主语从句，直接置于主语位置。
译文： 海洋正在被人们过度捕捞，许多年以来这已是尽人皆知的事情了。

2. That the plates are moving is not beyond dispute.
重点提示： 这里that从句that the plates are moving即是一个主语从句，直接置于主语位置。
译文： 地球板块是在漂移的，这一点毫无争议。
有时候，即使that从句比较长而复杂，也可能被直接置于句首来作主语（这样的句子结构并不常见），比 如：
3. That such a conjunction of circumstances might occur again soon, especially considering shrinking US defense budgets and diminishing overseas base access, is problematical at best.
-That such a conjunction of circumstances might occur again soon, that引导的从句作主语 由that引导的主语从句， 并且主语从句带有自己的状语
-especially considering shrinking US defense budgets and diminishing overseas base access, 修饰主语从句的分词作状语
-is problematical at best, 主句的谓语部分

重点提示： 看到句首的that such就知道，这里的that只能作为连词而不是指示词，因此可以判断其后接的必然是一个主语从句。另外，两个分词短语shrinking US defense budgets和diminishing overseas base access是并列关系，一同作分词considering的宾语。请注意：不要误认为considering与 diminishing 并列。
译文： 至于在近期内能否再次出现这种各个情况巧合的局面，即使是最乐观的看法也是值得怀疑的，尤其是考虑到美国国防预算缩减和海外基地减少的情况。
译文心得：这句话的语序不是常见的英文惯用语序。按照正常的英文思维的表达应该是It is problematical at best that...,即先表达态度，再展开叙事。而这句英文却符合汉语的思维方式，即先叙事后表态。所以，这句话就可以按照原文的顺序来翻译成汉语。 

但是，更常见的情况是用it作形式主语置于句首，而将that主语从句放在句末。因此，下列都是常见的主语从句句型（作文中常用的句型，重点内容）：
一、 It+be动词+过去分词+that从句
It's reported that...据报道  
It's believed that...据信
It is generally thought that...人们普遍认为  
It should be noted that...应当注意
It has been found that...现已发现  
It must be pointed out that…必须指出
同样可以这么用的动词还有：say, expect, know, estimate, forecast等。比如下面这些句子：
As a child — and as an adult as well — Bill Gates was untidy. It has been said that in order to counteract this, Mary drew up weekly clothing plans for him.
译文： 童年时期，以及即使长大成人后，比尔•盖茨也不修边幅。据说为了改掉他的这个毛病，玛丽为他制定了一周着装计划。
And it is imagined by many that the operations of the common mind can be by no means compared with these processes, and that they have to be acquired by a sort of special training.
重点提示： 该主语从句的基本结构是it is imagined that... and that...,即这里是两个that从句并列，在句中作主语，即并列的主语从句。
译文： 许多人以为，普通人的思维活动根本无法与科学家的思维过程相比，这些思维过程必须经过某种专门训练才能掌握°
It is generally agreed that a person of high intelligence is one who can grasp ideas readily, make distinctions, reason logically, and make use of verbal and mathematical symbols in solving problems.
重点提示： 这里是在过去分词agreed前面加了副词generally修饰，其他可以这么使用的副词有： universally, normally, usually 等。
译文： 人们普遍认为，高智商的人有这样的一些特点：理解力强、辨别力强、逻辑推理能力强，并且在解决问题的过程中善于利用文字或数学符号。

二、 It+be动词+形容词+that从句
It is clear that...显然  
It is possible that...很可能
It is likely that...很可能  
It is natural that...很自然
It is certain that...可以相信  
It is strange that...奇怪的是
It is fortunate that...幸运的是  
It is necessary that...有必要
请看例句：
Fortunately, the White House is starting to pay attention. But it's obvious that a majority of the president's advisers still don't take global warming seriously.
重点提示： 该主语从句的基本结构是it is obvious that..., 即这里是that引导的主语从句。
译文： 幸好白宫已经开始注意到全球变暖问题。但是很显然，总统周围的大多数顾问仍然没有认真对待该问题。
Furthermore, it is obvious that the strength of a country's economy is directly bound up with the efficiency of its
agriculture and industry, and that this in turn rests upon the efforts of scientists and technologists of all kinds.
重点提示： 该主语从句的基本结构是it is obvious that...and that...,即这里是that引导的并列主语从句，两 个连词that都要保留，尤其是第二个that不能省去。
译文： 再者，很显然，一个国家的经济实力与其工农业生产效率密切相关，而效率的提高又有赖于各类科技人员的努力。

三、It+be动词+名词短语+that从句
It is a pity that...可惜的是
It is good news that... 真是太好了。
It is no wonder that...难怪...  
It is an honor that...真荣幸...
It is common knowledge that... 是常识。
It is my belief that...我相信
It is a miracle that... 真是奇迹。
请看例句：
It is an established fact that factory workers work better, harder, and have fewer accidents when their machines are painted orange rather than black or grey.
译文： 事实证明，如果把工厂里的机器漆成橘黄色而不是黑色或灰色，工人就会干得更勤奋、更出色，事故也会更少。
It is a truth universally acknowledged that a single man in possession of a good fortune must be in want of a wife. （《傲慢与偏见》"Pride and Prejudice"的第一句话）
译文： 一个众所周知的事实是，一个单身汉若是非常有钱，那么他一定想要找个妻子。

四、不及物动词+that从句
It seems that...似乎  
It follows that...因此 / 由此可见
It happens that...碰巧  
It turns out that...结果证明是
It comes about that...结果是  

五、其他结构
It dawns upon/on sb. that...某人突然想起  
It occurs to sb. that...某人突然想起
It makes no difference that... 无所谓
It doesn't need to be bothered that...不必担忧
It is of little consequence that... 无关紧要
请看例句：
It dawned upon me that there is a logical connection between all the things that happen in that immensely connected body of salted water that covers 71 percent of the surface of the earth.
重点提示： 注意it dawns upon sb. that这个句型在译成汉语时要用人作主语，译作"某人想到 ”，但在英语里是用it作形式主语。
译文： 我忽然明白了，覆盖地球表面71%的巨大盐水体中所发生的一切事情之间都是有联系的，
When I decided to quit my full-time employment it never occurred to me that I might become a part of a new international trend.
重点提示： 注意it occurs to sb. that这个句型译成汉语时用人作主语，译作“某人想到……”，但在英语里是用it作形式主语。
译文：当我决定放弃全职工作的时候，我怎么也没有想到我会成为一个新的国际流行趋势的一部分。

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whether及连接代词或连接副词引导的主语从句
连词whether以及连接代词或连接副词引导主语从句一般放在句首，这不同于上面讨论的that引导的主语从句。请看例句：
Whether the Government should increase the financing of pure science at the expense of technology or vice versa often depends on the issue of which is seen as the driving force.
重点提示： 这里是whether引导的主语从句，谓语部分是depends on the issueo of后面接的which从句是一 个宾语从句，补充说明issue,相当于issue的同位语。
译文： 政府究竟是以减少对技术的经费投入来增加对纯理论科学的经费投入，还是相反，这往往取决 于把哪一方面看作是驱动性的力量。
However, whether such a sense of fairness evolved independently in capuchins and humans, or whether it stems from the common ancestor that the species had 35 million years ago, is, as yet, an unanswered question.
重点提示： 这个句子看起来较复杂，其实还是由whether引导的主语从句。这里是两个并列主语从句，由 并列连词or连接，谓语动词是is。
译文： 不过，这种公平感是在卷尾猴和人类身上各自独立演化而成的，还是来自于35, 000, 000年以前他们共同的祖先，这还是一个未解之谜。
① Whether the eyes are the windows of the soul is debatable; that they are intensely important in interpersonal communication is a fact.
重点提示： 这个句子里包含两个主语从句，分别由whether和that引导。
译文： 眼睛是否是“心灵的窗口”，这还有争议；但无疑，眼睛在人际交流中有着重要的作用。
我们再来看几个由连接代词或连接副词引导的主语从句，此时从句一般位于句首。
少 Whoever tries to resolve a conflict soon learns that nothing pleases everybody.
重点提示： 这里的连词代词whoever相当于who的强调形式，它引导的从句作主语，主句的谓语是learns。 其中whoever在从句中作主语。
译文：任何想要试图解决这个矛盾的人很快就会发现，他不可能让所有人都满意。
① What happened on September 11, 2001 will be forever etched in our memories.
译文：2001年的“9・11”事件将会永远印刻在人们的脑海里
Several days ago, a Beijing-based IT company fired about 400 people overnight. The act startled the fired employees and at the same time worried the rest. Moreover, what was special about this case was that the day before the 400 were fired, they all received from their boss a gift—the book Who Moved My Cheesed
重点提示： 这里是连词代词what引导的主语从句，what在从句中作主语。
译文： 几天前，北京一家IT公司一夜之间就解雇了 400名员工。这一事件震惊了被解雇的员工，同时也让其余员工感到担心。此外，有意思的是，就在这400名员工被解雇的前一天，他们都从老板那收到了一份礼物本名为《谁动了我的奶酪？》的书。
How well the predictions will be validated by later performance depends upon the amount, reliability, and appropriateness of the information used and on the skill and wisdom with which it is interpreted.
重点提示： 这里是连词副词how引导的主语从句，how well在从句中充当状语，修饰动词validated.
译文： 这些预测将在多大程度上为后来的表现所证实，取决于采用的信息的数量、可第性、适应性， 以及解释这些信息的技能和才智。

because引导的主语从句
在英语中，还有一种较为特殊的主语从句，即是由because引导的主语从句。这种主语从句的结构一般是 “because+陈述句”，置于主语位置，后面加谓语，而且这个谓语往往都是does not mean。在because前面往往会有just —词，起强调语气的作用。请看例句：
1 Just because someone doesn't love you the way you want them to doesn't mean they don't love you with all they have.
重点提示： 该句的主语是 just because someone doesn't love you the way you want them to 这个从句，谓语是 doesn't mean.
译文：如果有人没有以你希望的方式去爱你，并不意味着他们没有全身心地爱你。
2 Something which seems valuable at first may turn out to be worthless. Example: "All that glitters is not gold!" Just because something appears valuable does not mean that it really is valuable.
重点提示： 该句的主语是just because something appears valuable这个从句，谓语是does not mean。
译文： 有些东西乍看起来很值钱，但后来却证明是一文不值。比如，人们常说“闪光的并不都是金子”。 只是看起来很值钱的东西并不意味着真的很值钱。
再看下面这个比较好的例句，也许能引起读者的一些思考：
There is a big difference between activity and accomplishment. Just because you are doing something doesn't mean you are getting anywhere. One must evaluate one's activity in order to have accomplishment.
重点提示： 该句的主语是just because you are doing something这个从句，谓语是doesn't mean.
译文：工作与成就这两者之间是有很大差距的，仅仅是在不停地工作并不意味着你就取得了成就。因此，人们必须认真审视自己眼下的工作，看是否真能够取得成就。
思维总结
本节的重点是that主语从句的各种句型。其次，了解because引导的主语从句，做到会翻译即可。