YOU SAID:
Jonathan died on the boat
INTO JAPANESE
ジョナサンはボートで死んだ
BACK INTO ENGLISH
Jonathan died in a boat.
INTO JAPANESE
ジョナサンはボートで死んだ。
BACK INTO ENGLISH
Jonathan died in the boat.
INTO JAPANESE
ジョナサンはボートの中で死んだ。
BACK INTO ENGLISH
Jonathan died in the boat.
That didn't even make that much sense in English.