回答

・When will you be back?
・When are you planning to come back?

'「你什麼時候回來？」在英語中可以表達為 When will you be back? 或 When are you planning to come back?。

I would like to ask about the delivery date. When will Mr.〇〇 be back?
（我想詢問一下交貨日期，〇〇先生你什麼時候回來？？）

I think you are busy now, so I will call you back. When are you planning to come back?
（我想您現在很忙，所以我會稍後再打給您。你什麼時候回來？）希望這些能為您提供參考。

有幫助｜0