回答

・Please reply when you have time.
・Please reply when you are available.

「當您有空時請回覆給我」的英語是 Please reply when you have time. 或 Please reply when you are available.

I think you are busy now, so please reply when you have time.
（我知道您現在很忙，當您有空時請回覆我。）

This is not urgent, so please reply when you are available.
（這件事並不緊急，請在您有空時回覆。）

有幫助｜0