YOU SAID:

I have been eaten by a bear

INTO JAPANESE

クマに食べられてしまった

BACK INTO ENGLISH

I was eaten by a bear

INTO JAPANESE

クマに食べられた

BACK INTO ENGLISH

Eat by a bear

INTO JAPANESE

クマで食べる

BACK INTO ENGLISH

Eat with a bear

INTO JAPANESE

クマと一緒に食べる

BACK INTO ENGLISH

Eat with a bear