Look at the children （who are）playing soccer
保留括号里的,那么（who are）playing soccer.是定语从句.
去掉括号里的,就是动词的ing形式作后置定语.
Look at the children .They are playing soccer.
Look at the children .They are playing soccer.
这句话的同义句,
这句话的同义句,
英语人气：118 ℃时间：2019-09-22 03:54:49
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