动词的-ing形式做定语在句中通常有两个位置，
（1）如果是单个的动词的-ing形式做定语，常放在被修饰词前做前置定语;
He is an attacking player.
A little child learning to walk often falls.
Do you know the number of people coming to the party?
（2）如果是动词的-ing形式的短语做定语，常放在被修饰词后做后置定语。
1.A young man writing novels came to speak to us yesterday.
→A young man who writes novels came to speak to us yesterday.
2.The girl sitting next to me was my cousin.
→The girl who was sitting next to me was my cousin.
-ing形式做定语通常从以下三方面考查，即：
1)说明被修饰词的性质，特征或用途。如：
1.They set up an operating table in a small temple.
2.He may be in the reading room，for all I know.
2)与被修饰词为主动关系且表示正在进行的动作。如：
1.There were about 200 children studing in the art school.
2.Who is the woman talking to our English teacher?
3)有些-ing形式已经转化成形容词，常做定语用来修饰物，表示“令人……”。 3)有些-ing形式已经转化成形容词，常做定语用来修饰物，表示“令人……”。
1.That must have been a terrifying experience.那准时一段可怕的经历。
2.The experiment was an amazing success.那项试验是一个惊人的成功。
3.There is a page missing from this book.这本书
除了-ing形式能做定语外，如果-ing形式与被修饰词是被动关系，就用它的被动式，即being done.being doing通常表示正在被做，常做后置定语。如：
1.The tall building being built now is our new school.正在被建的高楼是我们的新学校。
2.The question being discussed was presented by the headmaster.正在被讨论的问题是被校长提出的。