Cohesion of sentences and coherence of writing are important means to achieve coherence of sentences and texts. If sentences or chapters lack the necessary cohesion, there will be no internal organic connection and logical development relationship between them, and the writing will be chaotic and unclear. Coherence is the organic combination of language content to make it logical, so as to achieve the standardization and accuracy of language. Cohesion and coherence are important components of sentences and texts. Cohesion can be divided into grammatical cohesion and lexical cohesion. Grammatical cohesion is achieved through grammatical means, including reference, substitution and ellipsis, while lexical cohesion is repeated through repetition, synonyms, antonyms and hyponymy. Coherence refers to whether there are connecting elements or cohesive words in sentences, sentences, paragraphs and paragraphs to explain their logical relationship. If there is a lack of necessary linking elements in writing, it is feasible to use punctuation only in Chinese. But in English, this kind of punctuation will make the meaning of the expressed content ambiguous. If I am tired and can't walk a step, it is wrong to write the following two forms in English: 1) "I am so tired that I can't walk a step"; 2) "I'm too tired to walk a step. The first sentence should be changed to I am so tired that I can't walk a step; In the second sentence, the subject I "should be repeated after that to make the meaning of the sentence clearer. But it is feasible in Chinese, which is the difference between English and Chinese. We should pay enough attention to it when learning to write. Label: Do a good job of sentence cohesion and coherence in writing.