我遲d要做英文故事分享.唔該高手睇下邊度有文法錯誤,請大家多多指正

我用左過去式去寫故事的plot - correct

First is the plot. The main character of the story was an old man. The book was about the relationship between this old man and his grandchild. The old man set off for North Pole to find the last polar bears with his dog, Roo. During the trip, he wrote letters to his grandchild regularly. These letters became an important means of communication between them. Those letters were all about his experience and what happened to him during the journey in the North Pole. They started sailing on the wonder journey and embarked on the adventure of their lifetime.