Alguien que me ayude a cambiar este texto a la voz pasiva por favor?

Alguien que me ayude a cambiar este texto a la voz pasiva por favor. Our story began in Canada, when a boy called mark finds a forest. Mark was in a park and decided to read a book. When he got bored he decided to explore the park. As he walked, he saw a gate, but is was closed. Mark was corious about what was there, so he came and opened the gate. When I entered, he saw that it was a really beautiful forest. As he walked, he found an otter, he thought it was cute, so much so that the played a few minutes with her. He went on his way and saw a lake Mark was frightened when he saw that on the other side of the lake, a large crocodile, which swam to the fish trying to eat them, but they managed to leave. The his crocodile, seeing that the fish had escaped, left the lake, so Mark was so frightened that he ran away until he discovered that he was trapped in a pile of trees. I arrived at a place where averything was quieter, but found a bear and the scare climbed a tree. The bear upon seeing him, began to speak to him, telling him that he would not do anything to him, that he would come down from that tree. Mark, even in fear, got off the tree when he was finally down, the bear invited him for a walk in the woods. They walked, while Mark talked to him of the places to which he has traveled, also told him that he once won a prize along with his friends. The bear told him that once he caught an animal to eat it, but said he did not like it, so he never did again. When decided to return, they realized that they did not know wherein the forest they were, the were two roads, but the forgot which way they came, they chose the one they tought was the right one, but they realized that the road they had chosen was the wrong one. Mark did not know what to do, he was scared, he had to go home. Of a sudden, Mark wakes up and realizes that everything had been a dream. He had fallen a sleep in the park. He decided to go home. When he arrived, he wrote everything he dreamed and realized that it had been a ridiculous dream and began to laught.