YOU SAID:

Whose boat is this boat?

INTO JAPANESE

このボートは誰の船ですか？

BACK INTO ENGLISH

Whose ship is this boat?

INTO JAPANESE

その船はこのボートは

BACK INTO ENGLISH

The ship was this boat

INTO JAPANESE

船はこの船

BACK INTO ENGLISH

This ship is a ship

INTO JAPANESE

この船は船

BACK INTO ENGLISH

This ship is a ship