写日记英文怎么说短语

"Write a diary" 或 "Keep a diary" 是常用的表达方式。

来源："Write" 是"写"的意思，"diary" 是"日记"的意思。

例句：

I write a diary every day before I go to bed. (我每天睡觉前写日记。)
She has been keeping a diary since she was a teenager. (她从十几岁开始写日记。)