YOU SAID:
My son is a huge fan of trains and monster trucks.
INTO JAPANESE
私の息子は電車やモンスター トラックの大ファンです。
BACK INTO ENGLISH
My son is a big fan of monster trucks and trains.
INTO JAPANESE
私の息子は、モンスター トラックや列車の大ファンです。
BACK INTO ENGLISH
My son is a big fan of monster trucks and trains.
That didn't even make that much sense in English.