It的用法归纳

It 的用法归纳
1. It指天气、光线、时间、距离、状况、环境情况等
2. It可代替前面已经叙述过的名词（指事物，动物或很小的小孩），以及something, anything, everything, nothing，和不是指人的this, that等---其作用是避免同一个名词的重复。

3. It代替前面已经说过的片语或从句，以避免重复。

4. It用做形式主语
1) 用在一些固定的结构里。

如；
It seems(appears, looks) that 好象
It happens that 碰巧
It occurs to sb that 某人想到
It is a pity(a shame, a fact, an honor, a wonder) that…
It is strange (natural, possible, likely, quite clear, unusual, etc.) that sb. should do…
It was said (reported, announced, arranged, decided, stressed, believed, etc.) that…
It doesn’t matter (doesn’t seem to matter much, doesn’t affect us, etc.)+ 连接代词或副词引起的从句
2) 不定式做真正的主语，用It作形式主语。

3) 动名词做真正的主语，用It作形式主语。

常有以下几种结构：
It is useless/ no use/ no good/ not any use/ not any good / not much use/ not much good+ V - ing
Is it any use/ any good +V -ing?
It is worth +V -ing
5. It作形式上的宾语
当句子的宾语是动词不定式或that 从句时我们有时用It作形式宾语。

6. It is (was) + 所要强调的部分（除谓语外）+that( or who) + 其余部分
注：当强调部分是某人时，之后的关系代名词that和who都可以。

7. It代表做某件事的人或辩明某人是谁。

E.g. Who is it? It is Mary.
8. It的惯用语。

E.g. It is very kind of you. (You are very kind)
It is all over with us. (There is no hope left for us.)
How is it with him? (How is he?)
That is it. (That’s what I mean. / That’s what I wanted to know.)
That’s the best (worst) of it!
英语常用句型：
It is said/reported/announced/estimated that…据说/报道/猜测/通告/估计
It is generally believed/ thought/accepted that…人们普遍认为
It never occurred to sb. that …某人从未想到
It is known to all that…众所周知
It really matters…真正重要的是
What really matters is …
It is better to do A than to do B 比起B来，做A 更好
prefer to do A rather than do B..宁愿做A 而不愿做B
would rather do A than do B…宁愿做A 而不愿做B
so/such….that…如此…以至于…
compared with….与…相比较
Not until….did sb. do
it is not until …that ….
Hardly had sb done…when sb did…
No sooner had sb done… when sb did…
It is obvious that 显然
It is a pity that …可惜的是
Iit seems/appears that …似乎
It happened that …碰巧
…think/feel/consider it to do
It is no use/good doing…做某事没有用处/好处It is up to sb. to do 某人有责任做某事
It is true that…。

是真的。