iii. 不定式、动名词、分词作表语

1. 不定式、动名词作表语相当于名词，主语和表语是对等关系，位置可颠倒。分词作表语相当于形容词，说明主语的性质、状态，是从属于主语的，主表位置不能颠倒。

Her job is taking care of the children.

她的工作是照料孩子。

Our duty is to train these students.

我们的职责是训练这些学生。

His report is very interesting .

他的报告很有趣。

I am pleased at the news.

我很高兴听到这个消息。

2. 不定式、动名词作表语比较：不定式作表语往往表示将来的行为；动名词作表语不受时间的限制。

My idea is to go there this morning.

我的想法是今天早上去那里。

Their work is producing TV sets .

他们的工作是生产电视机。

3. 动名词作表语时主语往往是抽象名词work, job, aim, duty, habit, news, task, wish, pleasure, idea, hope等，表语进一步说明主语的具体内容。

My hobby is sleeping .

我的业余爱好是睡觉。

My aim is being a university student .

我的目标是成为一名大学生。

4. 分词作表语时其逻辑主语就是整个句子的主语，其区别在于：

1）现在分词作表语时主语多是物，表语用来说明主语的性质，特征，意为“令人……的”

The film is quite moving .

这部电影很感人。

The news is surprising .

这个消息很令人吃惊。

2）过去分词作表语时主语多是人，表语多表示主语所处的状态：

She looked disappointed .

她看上去很失望。

We were all moved at his words.

我们都对他的话很感动。

3）注意这些词的过去分词与现在分词在意义上的不同：interest, move, worry, please, disappoint,　surprise, astonish, excite, touch, frighten。

I was interested in the interesting stories.

我对这些有趣的故事很感兴趣。

专项练习

1. Do you consider it any good _______ again?

A. to try

B. try

C. trying

D. for you to try

2. I don't think it's much good _______ to him.

A. writing

B. to write

C. to be written

D. being written

3. _______ the assignment 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. I don't remember _______ about it.

A. him telling us

B. his telling us

C. him to tell us

D. he tells us

5. Her wish is _______ an engineer.

A. becoming

B. become

C. to become

D. being come

6. Some people's greatest pleasure is _______.

A. fishing

B. to fish

C. to be fishing

D. being fish

7. The report was so _______ that they were all _______.

A. inspiring; exciting

B. inspiring; excited

C. inspired; excited

D. inspired; exciting

8. —You look pale.

—I feel a little _______.

A. tire

B. tired

C. tiring

D. tiresome

9. He seems _______ here for three years.

A. to be living

B. to have lived

C. to have been lived

D. to live

10. —What's made you so upset?

—_______ three tickets to the pop music concert.

A. Lost

B. Losing

C. Because of losing

D. Since I lost

答案速查　1-5　CAABC　6—10　ABBBB