YOU SAID:

I painted my bathroom sink green.

INTO JAPANESE

私はトイレのシンクを緑色に塗った。

BACK INTO ENGLISH

I painted the toilet sink green.

INTO JAPANESE

トイレの洗面台を緑色に塗った。

BACK INTO ENGLISH

The toilet washbasin was painted green.

INTO JAPANESE

トイレ・洗面台は緑色に塗装された。

BACK INTO ENGLISH

The toilet and washbasin were painted green.

INTO JAPANESE

トイレと洗面台は緑色に塗装された。

BACK INTO ENGLISH

The toilet and washbasin were painted green.