§ 4. It is easily seen that coordinative connections are correlated semantically with subordinative connections so that a compound sentence can often be transformed into

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a complex one with the preservation of the essential relational semantics between the clauses. The coordinative connections, as different from subordinative, besides the basic opposition to the latter by their ranking quality, are more general, they are semantically less discriminatory, less "refined". That is why the subordinative connection is regularly used as a diagnostic model for the coordinative connection, while the reverse is an exception rather than a rule. Cf.:

Our host had rung the bell on our entrance and now a Chinese cook came in with more glasses and several bottles of soda. → On our entrance, as our host had rung the bell, a Chinese cook came in with more glasses and several bottles of soda. There was nothing else to do, so Alice soon began talking again. → Alice soon began talking again because there was nothing else to do.

Speaking of the diagnostic role of subordinative constructions in relation to coordinative ones, it should be understood that this is of especial importance for the unmarked constructions, in particular for those realised by the conjunction and.

On the other hand, the coordinative connection of clauses is in principle not reducible to the subordinative connection, which fact, as in other similar cases of correlations, explains the separate and parallel existence of both types of clausal connection in language. This can be illustrated by the following example: I invited Mike to join us, but he refused.

It would appear at first sight that the subordinative diagnostic-specifying exposition of the semantic relations between the clauses of the cited sentence can be achieved by the concessive construction: "Though I invited Mike to join us, he refused". But the proper observation of the corresponding materials shows that this diagnosis is only valid for part of the possible contexts. Suffice it to give the following two contextual expansions to the sentence in question, of which only one corresponds to the cited diagnosis.

The first expansion: You are mistaken if you think that Mike was eager to receive an invitation to join us. I invited him, but he refused.

The given concessive reading of the sentence is justified by the context: the tested compound sentence is to be replaced here by the above complex one on a clear basis of equivalence.

The second expansion: It was decided to invite either Mike or Jesse to help us with our work. First I invited Mike, but he refused. Then we asked Jesse to join us.

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It is quite clear that the devised concessive diagnosis is not at all justified by this context: what the analysed construction does render here, is a stage in a succession of events, for which the use of a concessive model would be absurd.

§ 5. The length of the compound sentence in terms of the number of its clausal parts (its predicative volume), the same as with the complex sentence, is in principle unlimited; it is determined by the informative purpose of the speaker. The commonest type of the compound sentence in this respect is a two-clause construction.

On the other hand, predicatively longer sentences than two-clause ones, from the point of view of semantic correlation between the clauses, are divided into "open" and "closed" constructions. Copulative and enumerative types of connection, if they are not varied in the final sequential clause, form "open" coordinations. These are used as descriptive and narrative means in a literary text. Cf.:

They visited house after house. They went over them thoroughly, examining them from the cellars in the basement to the attics under the roof. Sometimes they were too large and sometimes they were too small; sometimes they were too far from the center of things and sometimes they were too close; sometimes they were too expensive and sometimes they wanted too many repairs; sometimes they were too stuffy and sometimes they were too airy; sometimes they were too dark and sometimes they were too bleak. Roger always found a fault that made the house unsuitable (S. Maugham).

In the multi-clause compound sentence of a closed type the final part is joined on an unequal basis with the previous ones (or one), whereby a finalisation of the expressed chain of ideas is achieved. The same as open compound sentences, closed compound constructions are very important from the point of view of a general text arrangement. The most typical closures in such compound sentences are those effected by the conjunctions and (for an asyndetic preceding construction) and but (both for an asyndetic and copulative syndetic preceding construction). Cf., respectively:

His fingernails had been cleaned, his teeth brushed, his hair combed, his nostrils cleared and dried, and he had been dressed in formal black by somebody or other (W. Saroyan).

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Pleasure may turn a heart to stone, riches may make it callous, but sorrow — oh, sorrow cannot break it (O. Wilde).

The structure of the closed coordinative construction is most convenient for the formation of expressive climax.