YOU SAID:

I sank your battleship

INTO JAPANESE

自分の戦艦を沈没しました。

BACK INTO ENGLISH

Was sunk your Battleship.

INTO JAPANESE

自分の戦艦を沈められました。

BACK INTO ENGLISH

His battleships were sunk.

INTO JAPANESE

彼の戦艦が沈められました。

BACK INTO ENGLISH

His ship was sunk.

INTO JAPANESE

彼の船が沈没しました。

BACK INTO ENGLISH

His ship was sunk.