Tae Kim Complete Guide: John: That’s so, isn’t it? If (I) ask is she/girlfriend she/girlfriend, (I) will understand, won’t (I)?

Question

John: That’s so, isn’t it? If (I) ask is she/girlfriend she/girlfriend, (I) will understand, won’t (I)?

アリヤン · Accepted Answer

ジョン：そうか。「彼女は彼女ですか」と聞けば分かるのか。

How do you say John: That’s so, isn’t it? If (I) ask is she/girlfriend she/girlfriend, (I) will understand, won’t (I)? in Japanese?