be busy (in)＋动名词

waste time (in)＋动名词

lose time (in)＋动名词

以上动名词作介词宾语，in常可省去。

You're wasting your time trying to explain it to him.

你跟他解释是在浪费时间。

3.动名词在deserve，need，require，want后作宾语时，表示被动的意思，相当于不定式的被动形式。

The following language points deserve mentioning/to be mentioned.

下面的语言点值得提及。

The old temple needs repairing/to be repaired.

这座旧庙需要修理。

4.在部分动词后用动名词作宾语或不定式作宾语，意义完全不同。

Hearing the doorbell，she stopped washing the dishes.

听见门铃声，她停止了洗碗。

Hearing the doorbell，she stopped to open the door.

听见门铃声，她停下手中的活去开门。

If the car won't start，try pushing it.

如果这辆车发动不起来，就试着推一推它。

You must try to be more careful.