小鸟正在玩用英文怎么说

你问的是关于 "小鸟正在玩" 这个概念的表达方式。在英语中，这可以用多种方式表达，例如：

The bird is playing.
The bird is having fun.
The bird is enjoying itself.

其中，"playing" 是一个动词，意思是 "玩"。"Having fun" 是一个短语，意思是 "玩得开心"。"Enjoying itself" 也是一个短语，意思是 "享受" 或 "尽情享受"。

举个例子，供你参考：

The pttle bird is playing with a piece of string. (这只小鸟正在玩一条细绳。)
The bird is having fun flying from branch to branch. (这只鸟玩得开心，从树枝飞到树枝。)
The bird is enjoying itself in the sun. (这只鸟在阳光下尽情享受。)