YOU SAID:

a potato flew around my room before i came here

INTO JAPANESE

ここに来る前にジャガイモが部屋を飛び回っていた

BACK INTO ENGLISH

Potatoes were flying around the room before coming here

INTO JAPANESE

ここに来る前にジャガイモが部屋を飛び回っていました

BACK INTO ENGLISH

Before coming here, potatoes were flying around the room

INTO JAPANESE

ここに来る前は、ジャガイモが部屋を飛び回っていました

BACK INTO ENGLISH

Before coming here, potatoes were flying around the room