Sentence is the basic unit of language use, which consists of words and phrases (phrases) and can express a complete meaning, such as telling someone something, asking a question, asking or stopping, expressing some emotion, and indicating the continuation or omission of a paragraph. There is a big pause between sentences. It should end with a period, question mark, ellipsis or exclamation point.
In order to express the meaning clearly, commonly used sentences include two parts: one part is the "who" or "what" said in the sentence (subject part); The other part is "what", "how" or "what to do" (predicate part) in the sentence.