YOU SAID:

i was the 1st man on the moon

INTO JAPANESE

私は月の最初の男でした

BACK INTO ENGLISH

I was the first man on the moon

INTO JAPANESE

私は月面に降り立った最初の人間でした

BACK INTO ENGLISH

I was the first man to walk on the moon

INTO JAPANESE

私は月面を歩いた最初の男でした

BACK INTO ENGLISH

I was the first man to walk on the moon