坚持用英语写英语怎么说

“坚持用英语写英语”在英语中叫做"stick to English"，也可以说"use English consistently"。
"Stick to" 这个短语的意思是坚持做某事，不改变。而"consistently" 表示始终如一，持之以恒。
例句：
To improve your English, it's important to stick to English when you're communicating with others.
I'm trying to use English consistently in my daily life to become more fluent.
I've found that the best way to learn a new language is to stick to it and not switch back to your native language.