Whether you use the first or third person when writing a memory book depends on the emotion and perspective you want to express. Using the first person would make it easier for the readers to understand and empathize with the author. They could feel the author's emotions and experiences more directly. For example, he could write down his friend's name, appearance, personality, experience, and so on to let the reader understand his friend more deeply. At the same time, it could also express the author's feelings for his friends, such as longing, regret, hope, and so on. Using the third person could make the story more objective and neutral, and it could better show the personality and experience of the friend. For example, he could write a friend's story instead of her name so that the reader would focus more on the story itself rather than the author's emotions. At the same time, it could also express the author's feelings for his friends, such as sympathy, understanding, blessings, and so on. When writing, one had to choose the most appropriate way to address a friend according to the emotions and perspective they wanted to express.