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同学们先看看2011年高考湖北卷完成句子的78题：
______________(他突然想到)that he had an important conference to attend the next morning. (occur)
答案 It (suddenly) occurred to him.
考生们做本题时往往是记住了这是一个特殊的句型，实际上稍微分析可知，本句是一个含主语从句的复合句，其中it是形式主语，真正的主语是后面that引导的从句。大家看occur在这里的用法：sth occur to sb 意思是sth come into (one’s mind) ，即“(某人)突然想起……”。如：
An idea has occurred to me. 我已经有主意了。
It occurred to me that he had gone to the USA. 我突然想到他已经去美国了。
It has never occurred to me that he is a cheat. 我从没想到他是一个骗子。
与occur用法相似的动词有：seem, happen, appear, matter。
其句子结构一般是：
It+seem/appear/happen/occur/matter+that ...
It seems that he is ill. (= He seems to be ill.) 他好像病了。
It happens that I have had some experience in dealing with him. (= I happen to have had some experience in dealing with him.) 我碰巧在与他打交道方面有些经验。
It appears that they are in bad need of help. 他们看上去很需要帮助。
It suddenly occurred to me that all are not thieves. 我突然想起，并不是所有人都是小偷。
It doesn’t matter that he couldn’t come. 他不能来也没关系。
常用it作形式主语的主语从句有以下三种情形：
1. It is+adj.+that ...
It was clear that he was absent. 很明显他缺席了。
It seems unlikely (that) she will refuse the help. 她应该不会拒绝帮助。
It’s certain that William will do well in the exam. 威廉肯定能考得很好。
It’s possible that he won’t come. 他可能不会来了。
注意 当表示建议，命令，要求等意义时，从句要用虚拟语气，谓语动词形式为(should) do。例如：
It is important that you (should) study hard. 对你来说，努力学习很重要。
It is necessary that you (should) obey the rules. 你必须要遵守规定。
试比较：
It isn’t surprising that he should have married her. 如果他与她结婚也没什么奇怪的。
It isn’t surprising that he married her. 他同她结了婚，这并不奇怪。
It is best that he (should) go. 他走了最好。
2. It+be+名词词组+that ...
It is a pity that we can’t go. 我们不能去真是太遗憾了。
It is common knowledge that the whale is not a fish. 鲸并不是鱼类是常识。
It is a pleasure that you have been here. 很高兴你能来这里。
It is a good idea that we’ll send for a doctor. 派人去请医生是个好主意。
注意 表示惊奇、惋惜等感情色彩时，通常用虚拟语气。例如：
It’s no surprise that Brian should have won the game. 如果布莱恩赢得了比赛也不奇怪。
试比较：
It was a dictionary that John bought at the store. (强调句型) 约翰在商店买的是一本词典。
It is time that the children were in bed/went to bed. (定语从句) 到孩子们睡觉的时间了。
It is high time that such problems were solved. （定语从句）是该解决问题的时候了。
3. It+be+过去分词+that ...
“It is said/reported/announced/thought/believed/proved/known/expected that ...”句型可转换成相应的不定式形式。例如：
It is known that he will go abroad next month. (= He is known to go abroad next month.) 下个月他就要出国了。
It is said that he has published another book. (= He is said to have published another book.) 听说他出版了另一本书。
少数形容词作表语也可转换，例如：
It is likely that he will succeed. (= He is likely to succeed.) 他似乎要成功了。
It is certain that he will come. (= He is certain to come.) 他肯定會来。
如suggest, insist, order, demand等动词的过去分词作表语时，that从句需用虚拟语气，例如：
It is suggested that each student (should) sing a song in English. 大家提议每个学生都要唱一首英文歌。
It is demanded that everyone (should) hand in their exercises in time. 要求每个人都必须按时上交作业。
从上面三种句子结构中不难看出，由引导词that引导的主语从句一般用it作形式主语，而把that引导的真正的主语从句后置。
【练习】
1.______________ (他突然想起) that he left his key in the house. (occur)
2.______________ (据要求) that all the students arrive at the school-gate in time.(demand)
3. It is necessary that______________ (每位学生要掌握)at least one foreign language. (master)
4.______________ (这个没关系) that he couldn’t attend our meeting on time. (matter)
5.______________ (似乎) that nobody knows his secret at this time. (seem)
6. He is believed______________ (已从监狱跑了). (escape)
7.______________ (很顯然) that you’ve made the same mistake again. (obvious)
8.______________ (真是碰巧) that you two were born on one day of the same year. (happen)
9.______________ (业已证明) the medicine has a strong effect on your disease. (prove)
10. It______________ (她突然想起) that she should adopt the homeless child. (strike)
【参考答案】
1. It occurred to him
2. It is demanded
3. every student should master
4. It doesn’t matter
5. It seems
6. to have escaped from prison
7. It is obvious
8. It (so) happened/happens
9. It has been proved that
10. struck her
______________(他突然想到)that he had an important conference to attend the next morning. (occur)
答案 It (suddenly) occurred to him.
考生们做本题时往往是记住了这是一个特殊的句型，实际上稍微分析可知，本句是一个含主语从句的复合句，其中it是形式主语，真正的主语是后面that引导的从句。大家看occur在这里的用法：sth occur to sb 意思是sth come into (one’s mind) ，即“(某人)突然想起……”。如：
An idea has occurred to me. 我已经有主意了。
It occurred to me that he had gone to the USA. 我突然想到他已经去美国了。
It has never occurred to me that he is a cheat. 我从没想到他是一个骗子。
与occur用法相似的动词有：seem, happen, appear, matter。
其句子结构一般是：
It+seem/appear/happen/occur/matter+that ...
It seems that he is ill. (= He seems to be ill.) 他好像病了。
It happens that I have had some experience in dealing with him. (= I happen to have had some experience in dealing with him.) 我碰巧在与他打交道方面有些经验。
It appears that they are in bad need of help. 他们看上去很需要帮助。
It suddenly occurred to me that all are not thieves. 我突然想起，并不是所有人都是小偷。
It doesn’t matter that he couldn’t come. 他不能来也没关系。
常用it作形式主语的主语从句有以下三种情形：
1. It is+adj.+that ...
It was clear that he was absent. 很明显他缺席了。
It seems unlikely (that) she will refuse the help. 她应该不会拒绝帮助。
It’s certain that William will do well in the exam. 威廉肯定能考得很好。
It’s possible that he won’t come. 他可能不会来了。
注意 当表示建议，命令，要求等意义时，从句要用虚拟语气，谓语动词形式为(should) do。例如：
It is important that you (should) study hard. 对你来说，努力学习很重要。
It is necessary that you (should) obey the rules. 你必须要遵守规定。
试比较：
It isn’t surprising that he should have married her. 如果他与她结婚也没什么奇怪的。
It isn’t surprising that he married her. 他同她结了婚，这并不奇怪。
It is best that he (should) go. 他走了最好。
2. It+be+名词词组+that ...
It is a pity that we can’t go. 我们不能去真是太遗憾了。
It is common knowledge that the whale is not a fish. 鲸并不是鱼类是常识。
It is a pleasure that you have been here. 很高兴你能来这里。
It is a good idea that we’ll send for a doctor. 派人去请医生是个好主意。
注意 表示惊奇、惋惜等感情色彩时，通常用虚拟语气。例如：
It’s no surprise that Brian should have won the game. 如果布莱恩赢得了比赛也不奇怪。
试比较：
It was a dictionary that John bought at the store. (强调句型) 约翰在商店买的是一本词典。
It is time that the children were in bed/went to bed. (定语从句) 到孩子们睡觉的时间了。
It is high time that such problems were solved. （定语从句）是该解决问题的时候了。
3. It+be+过去分词+that ...
“It is said/reported/announced/thought/believed/proved/known/expected that ...”句型可转换成相应的不定式形式。例如：
It is known that he will go abroad next month. (= He is known to go abroad next month.) 下个月他就要出国了。
It is said that he has published another book. (= He is said to have published another book.) 听说他出版了另一本书。
少数形容词作表语也可转换，例如：
It is likely that he will succeed. (= He is likely to succeed.) 他似乎要成功了。
It is certain that he will come. (= He is certain to come.) 他肯定會来。
如suggest, insist, order, demand等动词的过去分词作表语时，that从句需用虚拟语气，例如：
It is suggested that each student (should) sing a song in English. 大家提议每个学生都要唱一首英文歌。
It is demanded that everyone (should) hand in their exercises in time. 要求每个人都必须按时上交作业。
从上面三种句子结构中不难看出，由引导词that引导的主语从句一般用it作形式主语，而把that引导的真正的主语从句后置。
【练习】
1.______________ (他突然想起) that he left his key in the house. (occur)
2.______________ (据要求) that all the students arrive at the school-gate in time.(demand)
3. It is necessary that______________ (每位学生要掌握)at least one foreign language. (master)
4.______________ (这个没关系) that he couldn’t attend our meeting on time. (matter)
5.______________ (似乎) that nobody knows his secret at this time. (seem)
6. He is believed______________ (已从监狱跑了). (escape)
7.______________ (很顯然) that you’ve made the same mistake again. (obvious)
8.______________ (真是碰巧) that you two were born on one day of the same year. (happen)
9.______________ (业已证明) the medicine has a strong effect on your disease. (prove)
10. It______________ (她突然想起) that she should adopt the homeless child. (strike)
【参考答案】
1. It occurred to him
2. It is demanded
3. every student should master
4. It doesn’t matter
5. It seems
6. to have escaped from prison
7. It is obvious
8. It (so) happened/happens
9. It has been proved that
10. struck her