"One day a seagull was flying in the sky. Suddenly, it (pour remplacer the seagull?) looked down and saw a very big fish and it became very afraid because this fish was very long and big. He was so afraid that he decided to hide in the wood ( ) to remember what happened a few minutes ago (earlier au lieu de ago ?). The seagull said to himself " I don't think it (je mettrais this au lieu de it) was a fish..but what was it so..?" .. One of his friends appeared and he told him the story, his old friend looked at him and said : "are you serious?" . He answered anxiously "yes, I am!!!".. They both decided to go back to the beach to see what was the weird animal that was swimming in the sea. The two of them (j'aurais mis both, mais c'est déjà dans la phrase d'avant) took three stones to throw to the fish but this one decided to eat them before they do anything. He jumped up and ate the two seagulls. They were in the dark when they understood that they've been eaten by this damned spooky fish. His stomach was big and full of a hundred of spoons. They thought in a laugh " this fish eats all kinds of things he's really greedy". A week later, they were still in the stomach dying of starvation."
J'ai mis en gras ce que je changerais... Pour le reste, c'est pas forcément parfait, mais ça m'a l'air correct. (mais je vois peut être pas tout)