YOU SAID:

i have four hundred shotguns in my room

INTO JAPANESE

私の部屋には400発のショットガンがあります

BACK INTO ENGLISH

I have 400 shotguns in my room

INTO JAPANESE

部屋に400発のショットガンがあります

BACK INTO ENGLISH

There are 400 shotguns in the room

INTO JAPANESE

部屋には400発のショットガンがあります

BACK INTO ENGLISH

There are 400 shotguns in the room