CET-4 doesn't directly examine grammar, and the requirements are not very high, but if you are so bad that you can't even understand sentences, can't divide sentence components, can't break sentences, and can't understand the meaning of sentences, it is necessary to make up for it, because reading comprehension will affect the understanding of the text; In addition, it also has an impact on writing. I suggest you read more articles, and sometimes you can strengthen your understanding of articles through language sense and help you divide sentence structures.

Grammar is a branch of linguistics, which studies the inflections of "parts of speech" and "words" or other means to express their relationship according to certain usage, as well as the functions and relationships of words in sentences.

Including word formation and configuration, as well as word formation and sentence formation. Grammar has two meanings: first, it refers to the law of grammatical structure itself, that is, grammatical facts; One-finger grammar is a science to explore and describe the grammatical structure, and it is also a grammarian's understanding and explanation of the objective grammatical system.

There is no difference in grammatical facts, but grammarians have different materials, observation angles and analysis methods, and their grammatical systems are different. Grammar includes morphology and syntax. Morphology mainly refers to the formation, change and classification of words.

Syntax mainly refers to the composition and changing rules of grammatical units such as phrases and sentences.