高中英语语法：It的用法(1)

高中英语语法：It的用法

it可用作人称代词、指示代词、先行词及引导词等。

1. 人称代词it，是第三人称单数中性，代表前文已提到过的一件事物。如：

1）That vase is valuable. It's more than 200 years old. 那个花瓶很珍贵，它有200多年的历史。

2）I love swimming. It keeps me fit. 我喜欢游泳，它能使我保持健康。

当说话者不清楚或无必要知道说话对象的性别时，也可用it来表示。如：

3）It's a lovely baby. Is it a boy or a girl? 宝宝真可爱，是男孩还是女孩？

it可用来指代团体。如：

4）The committee has met and it has rejected the proposal. 委员会已开过会，拒绝了这项建议。

it用以代替指示代词this, that.如：

5）--- What's this? --- It's a pen. —这是什么？—是一支钢笔。

6）--- Whose book is that? --- It's Mike's. —那是谁的书？—是迈克的。

2. 指示代词it，常用以指人。如：

7）Go and see who it is. 去看看是谁。

8）--- Who is making such a noise? —是谁发出这样的吵闹声？

--- It must be the children. —一定是孩子们。

3.虚义it无指代性，常用作没有具体意义的主语，出现于表示天气、气候、温度、时间、地点、距离等意义的句子中。如：

9）It is half past three now. 现在是三点半钟。

10）It is six miles to the nearest hospital from here. 这里离最近的医院也有六英里。

11）It was very cold; it snowed and grew dark.

天气很冷；天下着雪，渐渐地变黑了。

it也常用来表示一般的笼统的情况。如：

12）It's awful—I've got so much work I don't know where to start. 糟透了——我有这么多工作要做我不知从何开始。

13）How is it going with you? 你近况如何？

14）Take it easy. 不要紧张。

it也常用于下列结构：

15）It looks as if the college is very small. 看起来这个学院很小。

16）It seems as though our plan will be perfect. 似乎我们的计划很完善。

17）It's my turn. 该轮到我了。

it也常用于某些习惯用语中作宾语，各该习惯用语有具体意义，但it并无具体意义。如：

cab it 乘车catch it 受责，受罚come it 尽自己分内come it strong 做得过

分walk it 步行make it 办成take it out of somebody 拿某人出气

4. 先行词it.

it充当形式主语或形式宾语，本身无意义，只起一种先行引导的作用，先行词不重读。后面的真正主语或真正宾语通常是不定式结构、-ing分词结构或名词性从句。

（1）用作形式主语

18）It is difficult to translate this article. 翻译这篇文章很难。

19）It is getting harder every day for a lazy man to get a living. 懒汉谋生是日益困难了。

20）What time would it be most convenient for me to call again?什么时候我再给你打电话最合适？

21）It is no use going there so early. 这么早去那里没有用。

22）It has been a great honour your coming to visit me. 你的来访是我很大的荣幸。

23）It is strange that he did not come at all. 真奇怪，他竟还没来。

24）It doesn't matter what you do.什么都没关系。

在上述诸例中，后置的真正主语可以取代先行it的位置，而出现于句首。

To translate this article is difficult.

Going there so early is no use.

That he did not come at all is strange.

上述结构远不如用先行it结构普通。此外，也并非所有先行it结构都可作上述转换。如：

25）It seems that John is not coming after all. 似乎约翰终竟不来。

26）It happened that John was the only witness. 碰巧约翰是唯一的证人。

上述两例只能转换为：

John doesn't seem to be coming after all.

John happened to be the only witness.

（2）用作形式宾语

27）I found it difficult to explain to him what happened. 我觉得向他解释清发生了什么事很困难。

28）He thought it no use going over the subject again. 他认为再讨论这个问题没有用了。

29）They kept it quiet that he was dead. 他们对他的死保密。