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.

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。