there are sb doing中的doing 是什么成分

There were cows grazing beside the river.

这种结构 grazing 是进行时态吗, were 提前了?

there are sb doing 中的 doing 不是进行时态，也不是 are 被提前。

其实这里的 doing 为现在分词作定语，修饰其前的名词，相当于一个定语从句：

There were cows grazing beside the river.

=There were cows which were grazing beside the river.

蒋学文 - 英语教师

擅长：英语 | 采纳率 89% | 回答于 1秒前

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黎反修 - 英语翻译（已退休） 1秒前

擅长：数词用法,存在句,英语考试

这里的 grazing beside the river 是现在分词短语，作 cows 的后置定语。