一般现在时
动名词作主语的用法：
Talking like that is not polite.那样说话不礼貌。
动名词作主语时，通常用作形式主语。
It’s no use waiting herelet’go home.
在这儿等着也没用，我们回家吧。
It’s very nice climbing this mountain.
爬那座山很舒服。
2作表语：动名词作表语时，一般表示比较抽象的、习惯的动作，表语和主语常可换。
The nurse’sjob is looking after the patients.
=Looking after the patients is the nurse’s job.
护士的工作是护理病人。
Seeing is believing.=Believing is seeing.
眼见为实。
One of his bad habits is not speaking clearly.
= Not speaking clearly is one of his bad habits.
说话不清楚是他的坏习惯之一。
