1. Incorrect collocation: it means that the collocation between sentence elements does not conform to language habits. Including improper collocation of subject and predicate, improper collocation of verb and object, improper collocation of subject and object, improper collocation of related words, improper collocation of rhetoric and head words, improper collocation of one side and two sides.
Second, word order inversion: refers to the disorder of sentence word order, leading to sick sentences. Including improper position of attribute or adverbial, improper word order, inversion of subject and object, improper position of function words and improper position of clauses.
Third, the composition is incomplete: refers to the lack of proper composition in a sentence, which affects the expression of meaning. There are several situations, such as the absence of subject or subject head, predicate or predicate head, object or object head.
4. Mixed sentence patterns: refers to the combination of two sentence patterns, resulting in confusion of sentence structure, unclear thinking and unsmooth sentence meaning. It mainly includes two mixed sentences, linking the former with the latter, changing lanes in the middle, opposing customers and so on.
5. Unreasonable: it means that there is nothing wrong with the grammatical structure of the sentence, but the expression goes against common sense, resulting in wrong classification, inconsistency, inversion of relations or inconsistent clauses.