A long time ago in France, there lived a boy named Bob. (tu musi byc jedno zdanie...)
Bob'S (musi byc 's) mom died a year ago (tu mi sie bardzo dziwnie czyta, wolalabym 'and') , Dad was a lumberjack and he had a lot of work. One night, Bob had a dream about his mother, who warned him against the monster from the nearby valley 'of killing children' (cos tu nie tak - nie za bardzo rozumiem tego). Bob got up in the morning and saw 'that dumb his siblings' (calkowicie nie rozumiem). He decided to find them so he went to a nearby valley where he found the bodies of 'their' (ich? chyba masz na mysli 'jego') brothers and sisters. he went to tell his father but could not find him.
Bob went into the house and then saw his father lying (tutaj brakuje pozycji...face-down) in blood in the kitchen, Bob was left alone after he saw his 'no living' (slowo jest 'dead') father. Bob ran out of the house and 'nobody since then has seen him' (to jest za bardzo po polsku...since then nobody has seen him).