YOU SAID:
Watermelons are amazing
INTO JAPANESE
スイカは素晴らしいです
BACK INTO ENGLISH
Watermelon is awesome
INTO JAPANESE
スイカは最高です
BACK INTO ENGLISH
Watermelon is the best
INTO JAPANESE
スイカが最高です
BACK INTO ENGLISH
Watermelon is the best
That didn't even make that much sense in English.