There are always students playing soccer on the grass.这里为何用playing.

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There are always students playing soccer on the grass.这里为何用playing.
There are always students playing soccer on the grass.这里为何用playing.

There are always students playing soccer on the grass.这里为何用playing.
前面有了动词are,如果用play,句子就有两个动词,成病句了.

分词作定语,
playing =who are playing。。。

现在分词作后置定语,在操场上总有一些踢足球的学生。这里很容易与there be+现在进行时相混。这里表示不是正在进行的动作,因此不能以此来解释。