YOU SAID:

No one else was in the room where it happened...

INTO JAPANESE

誰もは、たまたま部屋にいた.

BACK INTO ENGLISH

Anyone that happens to be in the room.

INTO JAPANESE

部屋であることを起こるだれでも。

BACK INTO ENGLISH

Anyone who happens to be in the room.

INTO JAPANESE

誰の部屋であることを起こる。

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Happens to be in someone's room.

INTO JAPANESE

誰かの部屋であることを起こる。

BACK INTO ENGLISH

Happens to be in one of the rooms.

INTO JAPANESE

客室のいずれかであることを起こる。

BACK INTO ENGLISH

Happens to be in one of the rooms.