同样是形容词的话。ed结尾的修饰人，ing结尾的修饰物。
ed结尾的动词表被动，ing结尾的动词表主动。
例：He was telling his classmates.
他正在告诉他的同学。
The kids were playing on waste ground near the school.
孩子们在学校附近的荒地玩耍。
What do you think you are playing at?
你以为你在搞什么名堂？
These units played a key functional role in the military operation.
这些单位在军事行动中起到了主要的职能作用。
It is one of the greatest roles she has played.
这是她所扮演过的最重要的角色之一。
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