谁能告诉我:动名词可以作定语吗

可以的。

1，做前置定语

a walking stick= a stick for walking

a sleeping place=a place for sleeping

a washing machine= a machine for washing clothes

2 做后置定语

Go tell the kids shouting outside the classroom to make make less noise.

Our English teacher, wearing a suit, went to a party yesterday.

Note: 前置定语一般是单个单词，如waslking, washing

后置定语一般是动词短语，如 shouting outside classroom, wearing a suit,.

Hope it helps.