there are thousands of people standing outside the gate now.为什么不能写 are standing
问题描述：
there are thousands of people standing outside the gate now.为什么不能写 are standing
答
因为前面有谓语动词are,所以这里不能再出现谓语动词,我们这里用动词的ing形式,修饰前面的people,动词的ing形式表示主动.
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