The paper considers the structure of discourse referred to as text and a unit of the highest level of language. According to the idea that language and thought are inseparable in their interaction, we propose describing the syntactic matrix of discourse in terms of the communicative structure of sentences as its constituent parts.
This article presents an attempt to prove that the notion of sentence despite its complexity and umbiguity is not undefinable. The sentence is considered as a linguistic unit with the domonant feature of binomiality conditioned by the presence of grammatical predicativeness. Special attention is paied to gnoseological and ontological aspects of the sentence as well as the problem of differentiation between the sentence and the utterance.