YOU SAID:

where is the bathroom I need to use it

INTO JAPANESE

私がそれを使用する必要がある場所はどこですか

BACK INTO ENGLISH

Where is the place I need to use it?

INTO JAPANESE

使用する場所はどこですか。

BACK INTO ENGLISH

Where is the place to use?

INTO JAPANESE

使用する場所はどこですか？

BACK INTO ENGLISH

Where is the place to use?