Sequential narration is written in the order of occurrence, development and ending, and the cause and effect are very clear. Such as "one party"; Flashback refers to writing what happened later in front and what happened first in the back. Tell the ending first to attract readers to understand its cause and process, such as "The Back"; Interpolation means that in the process of narration, other related plots need to be inserted, and then the following things are described, such as the pear flower in the post road.