YOU SAID:

I am going to become the worlds most greatest swordsman

INTO JAPANESE

世界一の剣豪になるんだよ

BACK INTO ENGLISH

I'll become the world's best swordsman

INTO JAPANESE

世界一の剣豪になるよ

BACK INTO ENGLISH

I will become the best swordsman in the world

INTO JAPANESE

世界一の剣豪になるよ

BACK INTO ENGLISH

I will become the best swordsman in the world