他正在吃早餐用英文怎么说

"He is having breakfast" 是表示他正在吃早餐的英语表达方式。

这是一种常用的日常英语表达方式，来源于英语日常交流中的常用语。

例句:

He is having breakfast at the moment. (他正在吃早餐。)
She is having breakfast with her family. (她正在和家人一起吃早餐。)
The children are having breakfast before going to school. (孩子们在上学前吃早餐。)