可以是動名詞做主語，賓語，表語，例如：
1. Watching movie is a good way to learn a language.
2. I like playing basketball.
3. My favorite outdoor activity is going hiking.
-ing形式也可以作狀語，例如：
Opening the door, he found his dog lying on the floor.
另外有一些句型也需要使用-ing形式，我們來做一個總結，避免大家出錯。
A. there"s no point in doing something（做某事沒有意義）
it"s no use doing something （做某事沒用）
it"s no good doing something （做某事沒用）
例句：
There"s no point in having a car if you never use it.
There was no point in waiting any longer, so we left.
It"s no use worrying about what happened. There"s nothing you can do about it.
It"s no good trying to persuade me. You won"t succeed.
B. it"s worth doing something（值得做某事）
it"s not worth doing something （不值得做某事）
It"s a nice town. It"s worth spending a few days there.
Our flight was very early in the morning, so it wasn"t worth going to bed.
C. have trouble doing something
have difficulty doing something
have a problem doing something（這三個意思相似，都是做某事有困難）
I had no trouble finding a place to stay.
可以是動名詞做主語，賓語，表語，例如：
1. Watching movie is a good way to learn a language.
2. I like playing basketball.
3. My favorite outdoor activity is going hiking.
-ing形式也可以作狀語，例如：
Opening the door, he found his dog lying on the floor.
另外有一些句型也需要使用-ing形式，我們來做一個總結，避免大家出錯。
A. there"s no point in doing something（做某事沒有意義）
it"s no use doing something （做某事沒用）
it"s no good doing something （做某事沒用）
例句：
There"s no point in having a car if you never use it.
There was no point in waiting any longer, so we left.
It"s no use worrying about what happened. There"s nothing you can do about it.
It"s no good trying to persuade me. You won"t succeed.
B. it"s worth doing something（值得做某事）
it"s not worth doing something （不值得做某事）
例句：
It"s a nice town. It"s worth spending a few days there.
Our flight was very early in the morning, so it wasn"t worth going to bed.
C. have trouble doing something
have difficulty doing something
have a problem doing something（這三個意思相似，都是做某事有困難）
例句：
I had no trouble finding a place to stay.