YOU SAID:
Bananas are a tropical fruit.
INTO JAPANESE
バナナは熱帯果実です。
BACK INTO ENGLISH
Bananas are tropical fruits.
INTO JAPANESE
バナナはトロピカルフルーツです。
BACK INTO ENGLISH
Banana is tropical fruit.
INTO JAPANESE
バナナはトロピカルフルーツです。
BACK INTO ENGLISH
Banana is tropical fruit.
That didn't even make that much sense in English.