英语句子there are some children having fun in the yard

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英语句子there are some children having fun in the yard
为什么这里要用having?而不是have.
而且为什么There are some children who are having fun in the yard.(定语从句)
= There are some children having fun in the yard.（伴随状语）?

having是非谓语.一句话里不能有两个谓语,are已经是谓语,所以第二个动作have只能变为动名词having,作伴随状语,表示的是一种状态,children正在Have fun
定从相当于加了一句从句了,所以就可以出现be动词are,are having是从句的谓语

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