i. 动名词作主语和表语

Seeing is believing.

眼见为实。

Saying is easier than doing.

说比做容易。

Her job is keeping the hall as clean as possible.

她的工作是尽量保持大厅整洁。

Reading is learning , but applying is also learning and the more important kind of learning.

读书是学习，使用也是学习而且是更重要的学习。

1. 名词use, good, pity, time, fun, bore, a waste of time, worth（形容词）等作表语时，常用it作形式主语而把真正的主语动名词后置：

It is no use waiting for him; he won't come.

等他没用，他不会来的。

It is no good staying up so late every evening.

每天晚上熬夜是没有好处的。

It is a waste of time talking about it here.

在这里谈论它是浪费时间。

2. “there is no +动名词”结构相当于It is impossible to do sth.,此时动名词通常带有宾语。

There's no joking about such matters.

对这样的事情没有玩笑可言。

There's no getting along well with him.

不可能和他相处好。

There's no hiding of the evil but not to do it.

要想人不知除非己莫为。

3. 用于布告形式的省略结构中，意义上相当于祈使句。动名词通常不带宾语。

No smoking ！ = Don't smoke.

不许抽烟。

No parking ! = Don't park.

不许停车。

专项练习

1. _______ to the sunlight for too much time will do harm to one's skin.

A. Exposed

B. Having exposed

C. Being exposed

D. After being exposed

2. It is no _______ arguing with Tim, as he will never change his mind.

A. use

B. help

C. useful

D. time

3. _______ his homework made his father lose his temper.

A. The boy's not having done

B. The boy not having done

C. The boy's having not done

D. The boy having not done

4. —What has made you so upset?

—_______ my pet cat.

A. Lost

B. Losing

C. Because of losing

D. Since I lost

5. It is no good _______. You should give _______.

A. drinking; it up

B. to smoke; it up

C. smoking; up it

D. to drink; up it

6. This news sounds _______.

A. encouraging

B. encouraged

C. encourage

D. to encourage

7. What worried the child most was _______ to visit his mother in the hospital.

A. his not allowing

B. his not being allowed

C. his being not allowed

D. having not been allowed

8. The problem is _______ land for it.

A. find

B. found

C. finding

D. to found

答案速查　1-5　CAABA　6—8　ABC