YOU SAID:

I was walking down the street when a car hit me

INTO JAPANESE

車が私にぶつかったとき私は通りを歩いていた

BACK INTO ENGLISH

I was walking down the street as the car bumped into me

INTO JAPANESE

車がぶつかって通りを歩いていた

BACK INTO ENGLISH

A car hit and walked down the street

INTO JAPANESE

車がぶつかって通りを歩いた

BACK INTO ENGLISH

A car hit and walked down the street