it作为形式主语和形式宾语的基本句型
1.it be +形容词/过去分词+主语从句
2.it be+名词词组(a/an fact/pity/shame/honor/question)+主语从句
it作形式宾语：it作形式宾语，常见于以下动词之后：think,make,find,consider,feel,suppose等
扩展资料
（一）it作形式宾语：
1.it作形式宾语，常见于以下动词之后：think,make,find,consider,feel,suppose等。
Example: I find it easy to work this math problem out.①
We feel it impossible to move the heavy stone.
Do you think it necessary to learn English well？
2. it作形式宾语的句子与宾语从句：
我们以句①为例一起来对比一下两者的不同：
形式宾语：I find it easy to work this math problem out.
宾语从句：I find (that) it is easy to work this math problem out.
（二）it作形式主语
1.it be +形容词/过去分词+主语从句：
Example : It is important that we should exercise every day.
It was said that our school team won this football game.
2.it be+名词词组(a/an fact/pity/shame/honor/question)+主语从句：
Example:It was a pity that you didn’t come yesterday.
It was a question whether we can arrive there on time.
3.it +不及物动词(happen、appear) +主语从句
Example : It happened that he was her brother.
It appears that they meet at the school library.
3.it be +形容词 +for sb./of sb. to do sth.
Example : It’s very kind of you to help him with his English.
It’s necessary for us to master a foreign language
