Look!There are a lot of children playing in the ground.为什么要用playing而不用are playing
人气：165 ℃ 时间：2019-08-20 10:03:10
解答
因为前面有 There are 所以再用一个are没有必要
There be .. doing .. 固定的用法
其实也可以把doing 看成定语. 修饰children
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