或许那个时候你还不在上海。翻译成英文

Maybe you were not in Shanghai then.
简洁译法

我觉得你问的意思是：那个时候你还没来上海呢

所以我认为应该是：Maybe you have not yet been in Shanghai at that time.

Perhaps you were not yet in Shanghai at that time.

At that time, you may not in Shanghai.

Maybe you were not in Shanghai at that moment

Maybe you haven't in Shanghai at that time!