YOU SAID:

take my roomkey, no one will know.

INTO JAPANESE

私のルームキーを持って、誰も知らないでしょう。

BACK INTO ENGLISH

No one knows with my room key.

INTO JAPANESE

私の部屋の鍵は誰にもわかりません。

BACK INTO ENGLISH

No one knows the key to my room.

INTO JAPANESE

誰も私の部屋の鍵を知りません。

BACK INTO ENGLISH

No one knows my room key.

INTO JAPANESE

誰も私の部屋の鍵を知りません。

BACK INTO ENGLISH

No one knows my room key.