it 作形式主语句式结构
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6. It + be +形容词+ of sb. +动词不定式，这类形容词常是表示心理品质,性格特征的形容词，如：kind, nice stupid, clever, foolish, polite, impolite, silly, selfish, considerate等。
某人和这些形容词可以构成主系表结构。如：
表语从句：
1. This is what I want to do.
2. The house is what he needs.
3. The question is how the people can find an effective way to store the sun’s heat.
4. The question is who can complete the difficult task.
6. Dad made a promise that he would buy me CD player if I passed the English test.
7. Where did you get the idea that I could not come?
8. We haven’t settled the question where we are going to spend our summer vacation.
It will take a whole day to get to the top of the mountain on foot.
主语从句：
1.
他来帮助你是确实无疑的。
2.
月球上有没有生命是个有趣的问题。
3.
他要跟我们说什么，还不清楚。
4.
谁能赢得这场比赛还不得而知。
5
．英语晚会将在哪里举行，还没有宣布。
6
．我们都知道他是如何成为一名作家的。
7.
他没来参加这个聚会真是一个遗憾。
8.
很显然，学生应该改为他们的未来做好充分的准备。
表语从句
1.
这就是我想做的
2.
这房子正是他最需要的东西。
3.
问题在于人们怎样才能找到一种有效的方式来储藏太阳热。
4.
问题是谁能完成这项困难的任务。
5.
今天讨论的话题是未来的学校会是怎样的。
It’s very kind of you to help me with the work.
=You are kind to help me.
It seemed selfish of him not to share his dictionary with others.
=He seemed selfish not to share his dictionary with others.
It’s a waste of time talking to her any more.
It is no use arguing about the matter with him.
9. It + take ( sb. )+时间（金钱）+动词不定式，如：
It took the workers almost three years to finish building the dam.
CD player
的承诺
7.
你是从那里得到我不会来的想法
?
8.
我们还没有解决我们要去哪里度过暑假的问题
.
宾语从句：
1.
我相信他是忠诚的。
2.
我想知道他来还是不来。
3.
一切要看我们是否有足够的钱。
4.
我不知道它是否有意思。
5.
他不在乎天气是否好。
6.
我们决不能认为自己什么都好，别人什么都不好。
7.
我们认为你不在这。
5.He doesn’t care if it isn’t a fine day.
6.We must never think (that) we are good in everything while others are good in nothing.
7.We don’t think you are here.
5. The discussion topic for today is what school will be like in the future.
6. The reason why he was late is that the traffic was busy.
7. The fact is that he told a lie to me.
6.
他迟到的原因是交通拥堵。
7.
事实是他对我撒谎了。
8.
这就是
Henry
怎样解决问题的。
同位语从句
:Biblioteka Baidu
1.
他们应该尝试第二次的想法值得考虑
2.
她工作很努力的事实我们都知道
3.
他们表达了他们将会再次来拜访中国的希望
4.
我们队取得决赛胜利的消息令人兴奋。
5.
学生应该学些实用的东西的建议值得考虑。
6.
爸爸许下了我通过英语考试就给我买
这类不及物动词有：appear, happen, seem等，
如：It seemed that he didn’t tell the truth.
It happened that I was out when he called.
5. It + be +形容词+(for sb.）+动词不定式
这类句型常用形容词easy, difficult, hard, important, possible，wise等作表语，有时候为了强调不定式动作的执行者，常在不定式前加for sb，如：
3.What he wants to tell us is not clear.
4.Who will win the match is still unknown.
5.Where the English evening will be held has not yet been announced.
7. It + be +名词词组+动词不定式，如：
It is not a good habit to stay up too late.
8. It + be +名词或形容词+动名词，这类名词和形容词常常是：good, no good, no use, a waste of, useless, senseless等，如：
8. This is how Henry solved the problem.
同位语从句：
1. The idea that they should try a second time is worth considering.
2. The fact that she works hard is well known to us all.
It’s necessary for the young to master two foreign language.
It is unwise to give the children whatever they want.
这类形容词有：easy, difficult, hard, important, possible，wise
6.It is known to us how he became a writer.
7.It is a pity that he didn’t take part in this party.
8.It is obvious to students that they should get well prepared for their future.
8.I don’t believe he will do so.
9.We must make it clear that anyone who breaks the law will be punished.
10.Please tell me what you want.
11.She always thinks of how she can work well.
1. It + be +形容词+主语从句，如：
It is uncertain whether he can come to Jenny’s birthday party or not.
2. It + be +名词词组+主语从句，这类名词有：a fact, a pity, a shame, an honour，a question等，如：It’s a pity that you missed the exciting football match.
3. They expressed the hope that they would come to visit China again.
4. The news that our team has won the final match is exciting.
5. The suggestion that students should learn something practical is worth considering.
8.
我相信他不会这样做。
9.
我们必须认清无论谁违反了法律都要受到惩罚。
10.
请告诉我你需要什么？
11.
她总是在想怎样能把工作做好。
Keys
：
主语从句：
1.That he will come and help you is certain.
2.Whether there is life on the moon is an interesting question
宾语从句：
1.I believe (that) he is honest.
2.I wonder whether he will come or not.
3.Everything depends on whether we have enough money.
4.I don’t know if (whether) it is interesting.
It remains a question whether he will come or not.
3. It + be +过去分词+主语从句，这类过去分词有：announced, believed, expected, hoped, decided, reported, said, shown等，
如：It is reported that 16 people were killed in the earthquake.
It is not decided who will give the operation to the patient.
4.It +不及物动词(seem, appear, happen等) +主语从句,
某人和这些形容词可以构成主系表结构。如：
表语从句：
1. This is what I want to do.
2. The house is what he needs.
3. The question is how the people can find an effective way to store the sun’s heat.
4. The question is who can complete the difficult task.
6. Dad made a promise that he would buy me CD player if I passed the English test.
7. Where did you get the idea that I could not come?
8. We haven’t settled the question where we are going to spend our summer vacation.
It will take a whole day to get to the top of the mountain on foot.
主语从句：
1.
他来帮助你是确实无疑的。
2.
月球上有没有生命是个有趣的问题。
3.
他要跟我们说什么，还不清楚。
4.
谁能赢得这场比赛还不得而知。
5
．英语晚会将在哪里举行，还没有宣布。
6
．我们都知道他是如何成为一名作家的。
7.
他没来参加这个聚会真是一个遗憾。
8.
很显然，学生应该改为他们的未来做好充分的准备。
表语从句
1.
这就是我想做的
2.
这房子正是他最需要的东西。
3.
问题在于人们怎样才能找到一种有效的方式来储藏太阳热。
4.
问题是谁能完成这项困难的任务。
5.
今天讨论的话题是未来的学校会是怎样的。
It’s very kind of you to help me with the work.
=You are kind to help me.
It seemed selfish of him not to share his dictionary with others.
=He seemed selfish not to share his dictionary with others.
It’s a waste of time talking to her any more.
It is no use arguing about the matter with him.
9. It + take ( sb. )+时间（金钱）+动词不定式，如：
It took the workers almost three years to finish building the dam.
CD player
的承诺
7.
你是从那里得到我不会来的想法
?
8.
我们还没有解决我们要去哪里度过暑假的问题
.
宾语从句：
1.
我相信他是忠诚的。
2.
我想知道他来还是不来。
3.
一切要看我们是否有足够的钱。
4.
我不知道它是否有意思。
5.
他不在乎天气是否好。
6.
我们决不能认为自己什么都好，别人什么都不好。
7.
我们认为你不在这。
5.He doesn’t care if it isn’t a fine day.
6.We must never think (that) we are good in everything while others are good in nothing.
7.We don’t think you are here.
5. The discussion topic for today is what school will be like in the future.
6. The reason why he was late is that the traffic was busy.
7. The fact is that he told a lie to me.
6.
他迟到的原因是交通拥堵。
7.
事实是他对我撒谎了。
8.
这就是
Henry
怎样解决问题的。
同位语从句
:Biblioteka Baidu
1.
他们应该尝试第二次的想法值得考虑
2.
她工作很努力的事实我们都知道
3.
他们表达了他们将会再次来拜访中国的希望
4.
我们队取得决赛胜利的消息令人兴奋。
5.
学生应该学些实用的东西的建议值得考虑。
6.
爸爸许下了我通过英语考试就给我买
这类不及物动词有：appear, happen, seem等，
如：It seemed that he didn’t tell the truth.
It happened that I was out when he called.
5. It + be +形容词+(for sb.）+动词不定式
这类句型常用形容词easy, difficult, hard, important, possible，wise等作表语，有时候为了强调不定式动作的执行者，常在不定式前加for sb，如：
3.What he wants to tell us is not clear.
4.Who will win the match is still unknown.
5.Where the English evening will be held has not yet been announced.
7. It + be +名词词组+动词不定式，如：
It is not a good habit to stay up too late.
8. It + be +名词或形容词+动名词，这类名词和形容词常常是：good, no good, no use, a waste of, useless, senseless等，如：
8. This is how Henry solved the problem.
同位语从句：
1. The idea that they should try a second time is worth considering.
2. The fact that she works hard is well known to us all.
It’s necessary for the young to master two foreign language.
It is unwise to give the children whatever they want.
这类形容词有：easy, difficult, hard, important, possible，wise
6.It is known to us how he became a writer.
7.It is a pity that he didn’t take part in this party.
8.It is obvious to students that they should get well prepared for their future.
8.I don’t believe he will do so.
9.We must make it clear that anyone who breaks the law will be punished.
10.Please tell me what you want.
11.She always thinks of how she can work well.
1. It + be +形容词+主语从句，如：
It is uncertain whether he can come to Jenny’s birthday party or not.
2. It + be +名词词组+主语从句，这类名词有：a fact, a pity, a shame, an honour，a question等，如：It’s a pity that you missed the exciting football match.
3. They expressed the hope that they would come to visit China again.
4. The news that our team has won the final match is exciting.
5. The suggestion that students should learn something practical is worth considering.
8.
我相信他不会这样做。
9.
我们必须认清无论谁违反了法律都要受到惩罚。
10.
请告诉我你需要什么？
11.
她总是在想怎样能把工作做好。
Keys
：
主语从句：
1.That he will come and help you is certain.
2.Whether there is life on the moon is an interesting question
宾语从句：
1.I believe (that) he is honest.
2.I wonder whether he will come or not.
3.Everything depends on whether we have enough money.
4.I don’t know if (whether) it is interesting.
It remains a question whether he will come or not.
3. It + be +过去分词+主语从句，这类过去分词有：announced, believed, expected, hoped, decided, reported, said, shown等，
如：It is reported that 16 people were killed in the earthquake.
It is not decided who will give the operation to the patient.
4.It +不及物动词(seem, appear, happen等) +主语从句,