|作者：李 翔 文章来源：本站原创 点击数： 更新时间：2013-6-4||
■本站特约作者 李 翔
That the moon has no light of its own is well-known. (主语从句)
All of us know (that) the moon has no light of its own. (宾语从句)
The reason is that the moon has no light of its own. (表语从句)
The fact that the moon has no light of its own is well-known. (同位语从句)
顾名思义，连词that引导的主语从句应放在主语的位置(即句首) 作主语，that没有任何意思，在句中也不充当任何成分，但却不可以省略。例如：That she should be ungrateful cut him to the heart.
That he is honest is undeniable.
That matter is composed of particles leaves no room for doubt.
这种结构通常用在正式文体中，目的是强调that从句。因此，更普通的结构是把that从句放在句末，另外用it放在主语位置而形成“It…that从句”结构。其中that从句称为真正主语 (Real Subject) ，it称为形式主语(Formal Subject) ， that有时可以省略。下列各组中两句话的意思完全相同，只是使用的场合有别而已：
That he will come today is quite possible.
It’s quite possible (that) he will come today is quite possible.
That some women do not earn equal pay for equal work is unfair.
It’s unfair (that) some women do not earn equal pay for equal work.
常用的v-link 有：appear，be, become, feel, look, prove, remain, seem。
根据John Sinclair主编的COLLINS COBUILD GRAMMAR PATTERNS2: NOUNS AND ADJECTIVES(上海外语教育出版社 2000年11月第1版) P480-484，“It+v-link+形容词+ that从句”可分为以下八种：
1. THE ‘LIKELY’ GROUP
These adjectives indicate whether something is likely or true, or not.
(1) arguable 可证实的；可论证的
It’s arguable that the legislation has had little effect on young people’s behaviour.
(2) axiomatic 不言而喻的；不证自明的
It is axiomatic that as people grow older they generally become less agile.
In the periods of Wei and Jin, being buried in homeland was very popular. It was more believable that he was buried in his homeland Jurong, which was also recorded in literatures.
It is certain that Rodney arrived the previous day.
It is just conceivable that a single survivor might be found.
He believes that it is correct that he is.他相信他是正确的。
(6) definite 明确的；确定的
It is definite that your dog has been poisoned, sir. Again, can you tell me with whom you have had differences lately?
By the way, it is demonstrable that the American people are working harder than they were 20 years ago…
For a time it seemed doubtful that he would move at all...
It is false that only a person in authority is an authority.
That may be fine for the
It’s guaranteed that my colleagues think I’m deranged...
It is scarcely imaginable that it should be otherwise.
It seems implausible that the projects would have gone ahead without her backing.
It is impossible that a body not have natural motion but only that of the animals.
(15) improbable不大可能的；未必会(发生) 的
It seems improbable that this year’s figure will fall much below last year’s 75,000.
It was inconceivable to me that Toby could have been my attacker...
After all, it is simply incontestable that Melville presents him as a man of admirable balance: brave but modest, firmly in control of his men without being overbearing, studious without being pedantic.
It is incontrovertible that race relations in the American military services have improved enormously.
It is incredible that they have been allowed to go this far.
(incredible=impossible or very difficult to believe)
It is indisputable that birds in the
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