“有一群孩子在公园里”英语翻译

A group of children in the park.
或者
There is a group of children in the park. 都可以。

不过第二个句子中那里用is而不是are 。a group of强调群体时要用is，若是指他们中的每个人， a group of前面带are。

there is a group of children in the park.

There are the group of children in the park