二、动词的-ing形式的用法
A．动词的-ing形式作主语
1．动词的-ing形式可直接置于句首作主语。
Seeing
is believing.百闻不如一见。
Collecting stamps is interesting.集邮很有趣。
Learning
about a language is easier than using it.学习有关语言的知识比使用语言容易。
Being
invited to the party was a great honor to the family.被邀请参加晚会是这家人的荣耀。
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。
It is
easy making plans, but it is difficult carrying them.制定计划很容易，实行它却很难。
It is no
use crying over spilt milk. 作无益的后悔是没有用的。
It's a
waste of time arguing about it. 争论这事是浪费时间。
必背：动词的-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。
B．动词的-ing形式作表语
动词的-ing形式作表语的有两种不同的含义：
1．表示主语的内容是什么。
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。
The real
question is getting to know the needs of the students.真正的问题是了解学生的需要。
His
hobby is collecting stamps.他的爱好是集邮。
2．表示主语具有的特征。
The
problem is quite puzzling.这个问题很令人困惑。
It was
astonishing to see the animals and plants that are found nowhere else in the
world. 看到了世界上其它地方找不到的动植物真是令人惊讶。
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