YOU SAID:

I once killed a man and buried him in a trash can

INTO JAPANESE

私は一度男を殺してゴミ箱に埋めた

BACK INTO ENGLISH

I killed a man and buried it in a trash can

INTO JAPANESE

私は人を殺してゴミ箱に埋めた

BACK INTO ENGLISH

I killed people and buried them in the trash can

INTO JAPANESE

私は人々を殺してゴミ箱に埋めました

BACK INTO ENGLISH

I killed people and buried them in the trash can