The task was completed. + The task seemed a very easy one. → The task, when completed, seemed a very easy one. The windows were closed.-\-She did not hear the noise in the street. —» The windows being closed, she did not hear the noise in the street.
The subject of the insert sentence may be either identical with that of the matrix sentence (the first of the above examples) or not identical with it (the second example). This feature serves as the first fundamental basis for classifying the semi-complex sentences in question, since in the derived adverbial semi-clause the identical subject is dropped out and the non-identical subject is preserved. It will be reasonable to call the adverbial semi-clause of the first type (i.e. referring to the subject of the dominant clause) the "conjoint" semi-clause. The adverbial complicator expansion of the second type (i.e. having its own subject) is known under the name of the "absolute construction" (it will further be referred to as "absolutive").
The given classification may be formulated for practical purposes as the "rule of the subject", which will run as follows: by adverbialising scmi-complexing the subject of the insert sentence is deleted if it is identical with the subject of the matrix sentence,
The other classificational division of adverbial semi-clauses concerns the representation of the predicate position. This position is only partially predicative, the role of the partial predicate being performed by the participle, either present or past. The participle is derived from the finite verb of the insert sentence; in other words, the predicate of the insert sentence is participialised in the semi-clause. Now, the participle-predicate of the adverbial semi-clause may be dropped out if the insert sentence, presents a nominal or existential construction (the finite verb be). Thus, in accord with this feature of their outer structure, adverbial semi-clauses are divided into participial and non-participial. E.g.: One day Kitty had an accident. + She was swinging in the garden. → One day Kitty had an accident while swinging in the garden. (The participle is not to be deleted, being of an actional character.) He is very young.+ He is quite competent in this field. —» Though being very young, he is
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quite competent in this field. → Though very young, he is quite competent in this field. (The participle can be deleted, being of a linking nature.) She spoke as if being in a dream. → She spoke as if in a dream. (The predicate can be deleted, since It is expressed by the existential be.) The two predicate types of adverbial semi-clauses, similar to the two subject types, can be briefly presented by the "rule of the predicate" as follows: by adverbialising semi-complexing the verb-predicate of the insert sentence is participialised, and may be deleted if it is expressed by be. Conjoint adverbial semi-clauses are either introduced by adverbial subordinated conjunctions or joined to the dominant clause asyndetically. The adverbial semantics expressed is temporal, broader local, causal, conditional, comparative. Cf. syndetic introduction of adverbial semi-clauses:
He was silent as if not having heard the call. → ...as if he had not heard the call. Read on unless told otherwise. → ... unless you are told otherwise. Although kept out of the press, the event is widely known in the diplomatic circles. → Although it is kept out of the press... When in London, the tourists travelled in double-deckers. → When they were in London... Asyndetic introduction of adverbial semi-clauses is characteristic of temporal and causal constructions. Cf.: Working on the book, the writer travelled much about the country. → When working on the book... Dialling her number, she made a mistake. → While dialling her number... Being tired, I could not accept the invitation. → As I was tired... As for the absolutive adverbial semi-clauses, they are joined to the dominant clause either asyndetically, or, mostly for the purpose of emphasis, by the conjunction with. The adverbial semantics of the absolutive complicator expansion is temporal, causal, and attendant-circumstantial. E.g.: