is a composite sentence built on the principle of coordination. Coordination can be expressed either syndetically or asyndetically.
A compound sentence consists of two or more clauses of equal rank which form one syntactical whole in meaning and intonation. Clauses that are parts of a compound sentence are called coordinate, as they are joined by coordination.
The main semantic feature of the compound sentence is that it follows the flow of thought; thus the content of each successive clause is related to the previous one.
Hence come two syntactical features of the compound sentence which distinguish it from the complex sentence: 1) the opening clause mostly plays the leading role, and each successive clause is joined to the previous clause; 2) the clauses are sequentially fixed. Thus a coordinate clause cannot change place with the previous one without changing or distorting the meaning of the whole sentence.
Speaking about communication types it should be mentioned that there are compound sentences consisting of clauses belonging to different communication types. In this case it is impossible to state to what type the compound sentence as a whole belongs.
e.g. These came nearer than most to meaning something to her, but what? (declarative + interrogative)
From the point of view of the relationship between coordinate clauses four kinds of coordinate connection are distinguished: copulative, adversative, disjunctive and causative-consecutive. The type of connection is expressed not only by means of coordinating connectives, but also by the general meaning of clauses conveyed by their lexical and grammatical content.
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