动名词可以做主语，宾语，表语，或者介词的宾语
一，  动名词是动词的一种形式，因此也可以有动词的某些特点，它可以有自己的宾语或者状语。
She is fond of colleting stamps.Excuse me for coming late.
另外我们也可以用一定得方式表示它逻辑上的主语
She doesn’t like your(Mary’s)talking that way.
它还有下面几种形式 主动形式被动形式一般式doingbeing done
完成式having donehaving been done
 
二，   动名词做主语 
Walking is good exercise. 走路时很好的运动 
Swimming develops the muscles. 游泳可以发展肌肉。 
Popularizing the new method was not an easy job. 推广那个新方法不是一件容易事。 
Smoking may cause cancer. 吸烟可能导致癌症。
 
也可以在下面两类结构中做主语
 1， It is no use sending him over. It’s too late already.派他去也没用，已经太晚了。
It’s no good waiting here. Let’s walk home. 在这等没好处，咱们走回家吧。
It’s nice talking to you.   和你谈话很愉快。
It was very difficult getting everything ready in time.要不一切按时准备完很不容易。

2， There is no joking about such matters.这种事开不得玩笑。
There is no denying the fact that the new method has greatly raised labour productivity.不容否认新方法大大提高了劳动生产率。