文档介绍：.
I saw the boy eating an apple.
.
The girl sitting under the tree is my sister.
Learning is important to modern life
动词ing 形式表示:
; 进行
2. 泛指,没有特别时间意义或****惯性长期性动作 构成:V-ing 形式由 “do＋ing” 构成，
其否定形式:“not doing”,
V-ing 是可以带宾语或状语构成 V-ing 短语，没有人称和数的变化，但有时态和语态的变化。
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(not) doing
(not) being done
(not) having done
(not) having been done
动词-ing 形式的分一般式和完成式:
1. 一般式:表示这个的动作正在进行或与谓语表示的动作同时发生.
2. 完成式:强调这个的动作在谓语动词所表示的动作之前完成.
如:他们有说有笑地走出教室
They went out of the classroom, talking and laughing.
由于已经在这个城市住了三年,她对它非常了解.
Having lived in this city for three years, she knows it very well.
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观察句子，找特点．
。
Swimming is her favorite sport.
。
I remembered sending him an e-mail last week.
。
They lived in a house facing south.
．
I saw the boy eating an apple.
房间干净
Her job is keeping the room clean.
6. 由于已经在这个城市住了三年,她对它非常了解.
Having lived in this city for three years, she knows it very well.
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1 动词-ing形式可直接置于句首作主语。
百闻不如一见。
Seeing is believing.= To see is to believe. 2 为了保持句子平衡，通常用先行词it作形式主语，而把真正的主语放在句末。
争论这事是浪费时间。
It's a waste of time arguing about it.
必 背 动词-ing形式作主语的几个常用句型。 It‘s no good talking to him. 和他谈话是没有用的。
It is useless telephoning him. He is not willing to come. 给他打电话没用。他不愿意来。
It‘s worth making an effort. 努力一下是值得的。
There is no saying when it will stop raining. 无法断定这场雨什么时候会停。
There is no joking about such matters. 这种事开不得玩笑。
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1 表示主语的内容
Her job is keeping the lecture hall as clean as possible.
她的工作是尽量使报告厅保持干净。
2 表示主语具有的特征(动词ing 相当一个形容词）
The problem is quite puzzling.
这个问题很令困惑。
1. Her work is ______( look )after the children.
2. My aim is ______( go ) to Tsinghua University.
3. One of my bad habit is ______(bite ) nails（指甲）.
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动词-ing形式既可作及物动词的宾语，也可作介词的宾语。
1 能用动词-ing形式作宾语的及物动词可分两类，一类是只能用动词-