如果要用中文描述一个人"一直在用英语"，可以说他"一直在使用英语"。

这个短语的来源可能源于人们对于某一特定语言的使用的描述，即一个人不断地使用某种语言来交流或进行其他活动。

下面是一些英文例句，用来描述一个人"一直在用英语"：

She has been using English for years.

He always uses English when he's at work.

They have been using English in their business meetings.

I have been using English to communicate with my international colleagues.