YOU SAID:

May I please use the bathroom?

INTO JAPANESE

お手洗いは可能性がありますか。

BACK INTO ENGLISH

Could you wash your hands?

INTO JAPANESE

手を洗うことができるか。

BACK INTO ENGLISH

You can wash your hands.

INTO JAPANESE

あなたの手を洗うことができます。

BACK INTO ENGLISH

You can wash your hands.