名词性从句
三种句型（陈述句，一般疑问句，特殊疑问句）充当四种成分（主语，宾语，表语，同位语）

陈述句：English is important
主语
That English is important is known to us all.
It's known to us all that English is important.
宾语,只有这种情况that可省略
We all know (that) English is important.
表语
Our consensus is that English is important.
同位语
My opinion that English is important is agreed by many people.

一般疑问句：Is English important?
主语
Whether(or not) English is important (or not) is my question.(这种情况只用whether不用if)
It is my question whether/if English is important.
宾语
I doubt whether/if English is important.
表语
My question is whether/if English is important.
同位语
My question whether/if English is important has been debated by many people.

特殊疑问句： Who did this?/Who is he?
主语
Who did this remains/is a mystery.
It remains/is a mystery who did this.
Who he is remains/is a mystery.
It remains/is a mystery who he is.
宾语
I wonder who did this.
I wonder who he is.
表语
My question is who did this.
My question is who he is.
同位语
My question who did this has been debated.
My question who he is has been debated.

主语从句
1. That the seas are being overfished has been known for years.
2. That the plates are moving is now beyond dispute.
Beyond dispute毋庸置疑
3. That such a conjunction of circumstances might occur again soon, espeicially considering shrinking US defense budgets and diminishing overseas base access, is problematical at best.
problematical有问题的
At best充其量

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
同样的词：say, expect, know, estimate, forecast等

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.
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.
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.

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…可以肯定的是
It is strange that…奇怪的是
It is fortunate that…幸运的是
It is necessary that…有必要

Fortunately, the White House is starting to pay attention. But it's obvious that that a majority of the president's advisers still don't take global warming seriously.
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.

三、It + be动词+名词短语+that从句
It is a pity that…可惜的是
It is a fact that…事实是
It is a good news that…真是太好了
It is a good thing that…真是件好事
It is no wonder that…难怪
It is a shame that…遗憾的是/真是太不像话了
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 miracle that…真是奇迹

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.
It is a truth universally acknowledged that a single man in possession of a good fortune must be in want of a wife.

四、It +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 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.
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.

Whether引导的主语从句
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.
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.
Whether the eyes are "the windows of the soul" is debatable; that they are intensely important in interpersonal communication is a fact.

Wh-副词引导的主语从句
Whoever tries to resolve a conflict soon learns that nothing pleases everybody.
What happened on September 11, 2001 will be forever etched in our memories.
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 Cheese?
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 interperted.

because引导的主语从句
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.
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.
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.

宾语从句
I've learned that love, not time, heals all wounds. I've learned that everyone you meet deserves to be greeted with a smile.
I've learned that there's nothing sweeter than sleeping with your babies and feeling their breath on your cheeks.
I assure you that I had no intention of offending you.
Prof. Lee's book will show you how what you have observed can be used in other contexts.
They gave who came to the meeting a pamphlet. pamphlet小册子
I find the best way to concentrate is to make notes on what the teachers are saying.
There is disagreement among economists about what money is and how money is measured.
"The test of any democratic society," he wrote in a Wall Street Journal column, "lies not in how well it can control expression but in whether it gives freedom of thought and expression the widest possible latitude, however disputable or irritating the results may sometimes be. We won't retreat in the face of any threats."
In recent years, the debate over whether fossil-appearing objects from Mars were, in fact, indicators of past or present life on that planet has prompted many to ask whether people are ready, psychologically, to accept the possibility of life elsewhere.
宾语从句后置
We believe it true that the human body is also a kind of good conductor.
We must make it clear that the parties involved are to make every effort to curb the pollution.
There are those who consider it questionable that these defense-linked research projects will account for an improvement in the standard of living or, alternately, do much to protect our diminishing resources.

表语从句
Most people get married believing a myth--that marriage is a beautiful box full of all the things they have longed for: companionship, sexual fulfillment, intimacy, and friendship. The truth is that marriage, at the start, is an empty box. You must put something in before you can take anything out. There is no love in marriage; love is in people, and people put it into marriage. There is no romance in marriage; people have to infuse it into their marriages. A couple must learn the art and form the habit of giving, loving, serving, praising--keeping the box full. If you take out more than you put in, the box will be empty.
Some women are much too preoccupied by family. Once the marriage begins to disintegrate, they're lost. That's where their unhappiness springs from and that's why most divorced mothers regard themselves as victims.

同位语从句
名词+that+陈述句
I have been left with the knowledge that it's better to expect nothing than to give everything and then be disappointed.
A century ago, Freud formulated his revolutionary theory that dreams were the disguised shadows of our unconscious desires and fears.
Concerns were raised that witnesses might be encouraged to exaggerate their stories in court to ensure guilty verdicts.
Evidence came up that specific speech sounds are recognized by babies as young as 6 months old.