If you mean something happened that was not intentional, it should be by accident. "The boy stepped on the cat's tail by accident."
By Accident
This was all in his brother's mind. The accident was just that, an accident.
you spell accident in french the same way you spell accident in english; accident
no
The address of the Accident Branch is: 106 S. North Street, Accident, 21520 0154
Has this car been in an accident?
3GNEK13T72G329800 was this truck in a accident was this truck in a accident 3GNEK13T72G329800
Accident doesn't have a past tense as it's not a verb. It's a noun.
A & b
He didn't have a car accident. He had a "DIVING" accident.
Sure. It won't be much of an accident but it can be an accident.