There were three girls jumping rope. 既然用过去式的话就是过去进行时。
There were three girls，they were skipping rope.
Three girls were skipping rope.
句子用过去进行时，动词be用过去式，行为动词用其现在分词。
时态错了，“正在” 应该是一般现在时
有三个女孩正在跳绳。
There are three girls jumping rope.
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