1，做前置定語
a walking stick= a stick for walking
a sleeping place=a place for sleeping
a washing machine= a machine for washing clothes
2 做後置定語
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: 前置定語壹般是單個單詞，如waslking, washing
後置定語壹般是動詞短語，如 shouting outside classroom, wearing a suit,.
Hope it helps.