内容正文:
1.性质:它具有动词的特点,但在句子中起着名词、形容词、副词的作用,充当主语、表语、定语、宾语、宾语补足语、状语的作用
即:做除谓语以外一切成分。
非谓语动词
在动词-ing前加not
Thank you for not smoking.
His not coming made everyone very disappointed.
动词-ing形式的否定形式:
动词的ing形式作主语,表语和宾语
什么是主语(subject)?
什么是宾语 (object)?
He likes his dog.
主语
宾语
Swimming is my interest.
I like reading.
主语
宾语
结论
_________不能作主语和宾语
_____________可以作主语和宾语
动词原形
动词的ing形式
1
动词-ing形式可直接置于句首作主语,谓语动词用单数。
Seeing is believing.
眼见为实。
A. 动词的ing形式作主语
Dancing is their hobby.
dance
hobby
Biting nails is not a good habit.
bite nails
habit
Doing exercise is the best way to lose weight.
do exercise
lose weight
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。
此类句型有:
总结:用it作 主语,而把真正的主语 移置句尾。
It is no use/ useless doing sth
It is no good doing sth.做....是没有好处的
It is worthwhile doing sth
It is pleasant doing sth
It is a waste of time doing sth
做……是没有用的。
做……是值得的。
做……是有乐趣的。
做……是浪费时间的
形式
动词ing形式
It is no use \ useless doing sth 做……是没有用处的。
It is no use