不定式做主语
英语中动词不定式做主语的用法:
可以直接作主语。如: To see is to believe. 但在英语中,常用it作形式主语,真正的主语即动词不定式放在后面。
如: It's wrong to play tricks on other people. It's our duty to keep our environment clean and tidy.
规律:动词不定式在句中作主语时,常放在It is +adj.(形容词)+to do sth.或 It is +n.(名词)+to do sth. it仅作形式主语。
动词不定式与动名词作主语时的区别:
1.表示一般的、泛指的或习惯性的行为用动名词;表示具体的、一次性的或将来的动作用不定式。如:
Swimming is fun in summer. 夏天游泳是有趣的事。
Swimming in this river is a great pleasure. 在这条河里游泳是件非常快乐的事。
注:有时这种区别并不很严格。但要注意:主语和表语要用同一种形式;平行结构中要用同一种形式。如:
To see is to believe. = Seeing is believing. 眼见为实。
Fishing is his favorite hobby, and collecting coins also gives him great pleasure 钓鱼是他的爱好,集邮也给他带来极大的乐趣。