"I am sorry. You can't return this."

Translation: 对不起，你不可以退货。

[jcreed]

Would 你不可以退货它 or 你不可以退货这个物 also be appropriate here?

[NasuSamaruk0]

First is more appropriate than the second since the given sentence does not indicate anything about the type of object/event. The most appropriate translation is

你不可以退货这个

since we do not exactly know the type of object within the given context.

[stephen_zissou]

Why not "你不能退货"? Why does it have to be 可以？