This composition is a semi-propositional composition. First of all, we should complete the topic of the composition, and then choose the corresponding materials to express the center of the article according to the supplementary content. For example, a typical propositional composition is entitled "The Most Beautiful Voice". The title of the article is a phrase that is biased. The head word "sound" defines the writing object of this paper, and the rhetorical component "most beautiful" plays a limiting role. ? First, determine the owner of the "sound". In more than ten years of life experience, we must have heard the "most beautiful voice". This voice can be a father's instruction or a mother's "lullaby"; It can be a teacher's criticism or a classmate's suggestion. Of course, we can also write about the wonderful music of the violin we play and the chirping of the dog at home after recovery ... It should be said that the choice of this article is quite wide. Second, focus on "the most beautiful". "The most beautiful" is not the key word in the title, but it must not be ignored. It is precisely because this "sound" is the most beautiful that it stays in our memory and is worth expressing in words. When writing, we must try our best to embody the "most beautiful" characteristics of this sound. I can write my feelings and influence on the "most beautiful voice" by means of foreshadowing, promotion first and comparison. Reflect the "most beautiful", and the center will naturally be clear. Third, choose a novel composition form. This article can be expressed in different forms. You can record the most beautiful sound you heard one day in the form of a diary; You can pour out your feelings to your relatives and friends in the form of letters-tell him (her) that his (her) teaching you is the most beautiful voice in the world; You can also design a reporter to talk to several young people in the form of interviews. The title is "The most beautiful voice in your memory". Of course, we must choose the right form and don't deviate from the theme for the sake of formal innovation.