I categorial structure of the word notion of Opposition. Oppositions in Morphology

IV. ACTUAL DIVISION OF THE SENTENCE.
COMMUNICATIVE TYPES OF SENTENCES
1. The Main Principles of Actual Division of the Sentence
The actual division of the sentence exposes its informative perspective showing what immediate semantic contribution the sentence parts make to the total information conveyed by the sentence.
From the point of view of the actual division the sentence can be divided into two sections: thematic (theme) and thematic (theme). The theme expresses the starting point of communication; it means that it denotes an object or a phenomenon about which something is reported. The rheme expresses the basic informative part of the communication, emphasizing its contexlually relevant centre. Between the theme and the theme intermediary, transitional parts of the actual division can be placed, also known under the term "transition". Transitional parts of the sentence are characterized by different degrees of their informative value.
2. Language Means of Expressing (he Theme and the Rheme
Language has special means to express the theme. They are the following: the definite article and definite pronominal determiners, a loose parenthesis introduced by the phrases "as to", "as for", and the direct word-order pattern.
In comparison with the language means used to express the theme, language has a richer arsenal of means to express the rheme because the rheme marks the informative focus of the sentence. To identify the rhematic elements in the utterance one can use a particular word-order pattern together with a specific intonation contour, an emphatic construction with the pronoun "it", a contrastive complex, intensifying particles, the so-called "there-pattern", the indefinite article and indefinite pronominal determiners, ellipsis, and also special graphical means.
3. Actual Division and Communicative Sentence Types
The theory of actual division has proved fruitful in the study of the communicative properties of sentences. In particular, it has been demonstrated that each communicative type is distinguished by features which are revealed first and foremost in the nature of the rheme.
As a declarative sentence immediately expresses a proposition, its actual division pattern has a complete form, its rheme making up the centre of some statement.
As an imperative sentence does not directly express a proposition, its rheme represents the informative nucleus not of an explicit usually zeroed. If the inducement is emphatically addressed to the listener, or to the speaker himself, or to the third person, thematic subjects have an explicit form.
The differential feature of the actual division pattern of an interrogative sentence is determined by the fact that its rheme is informa-lionally open because this type of sentence expresses an inquiry about information which the speaker does not possess. The function of the rheme in an interrogative sentence consists in marking the rhematic position in a response sentence, thus programming its content. Different types of questions are characterized by different types of rhemcs.
The analysis of the actual division of communicative sentence types gives an additional proof of the "non-communicative" nature of the so-called purely exclamatory sentences (e.g. "Oh, I say!"): it shows that interjectional utterances of the type don't make up grammatically predicated sentences with their own informative perspective; in other words, they remain mere signals of emotions.
The actual division theory combined with the general theory of paradigmatic oppositions can reveal the true nature of intermediary predicative constructions distinguished by mixed communicative features. In particular, this kind of analysis helps identify a set of intermediary communicative sentence types, namely, the sentences which occupy an intermediary position between cardinal communicative sentence types.