Lexical means of Theme and Rheme definition in Ukrainian and English are analyzed in the article. Among them are: negative pronouns, negative particles, special questions, parenthetic and modal words, approximators. The comparison of various linguistic devices, which can express the correlation between the base and the core of the utterance peculiar to each language, presents the linguistic interest. Naturally, the most interesting language means for the purpose of grammatical description are

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... ose with the help of which the theme-rheme organization is revealed. These instruments include: intonation, word order, syntactic structures, lexical means. Thus, the main aim of this article is to analyse the lexical means creating the theme and the rheme in the English and Ukrainian languages. Lexical means which single out the theme and the rheme in English and Ukrainian vary a lot. One of the most widely used lexical means creating the theme-rheme structure of the English statement is the emphatic verb to do. Used before the subject of the sentence this verb draws attention realising the logical stress. Such equivalent in the Ukrainian language does not exist. Another lexical means which singles out the theme and rheme structure of the sentence is negation. In English, it can be expressed by the theme and the rheme particle not, negative prefixes un-, dis-, in-, non-, il-, im-, ir-, no-, negative pronouns nobody, nothing, none. In English statement the stress falls on the negative particle not, emphasizing the predicate. Pronouns nobody, nothing, none due to their negative meaning are always under logical stress and, thus, are the rheme of the utterance. In the Ukrainian language negative particles serve to negate the content of the whole utterance or parts of it. In the Ukrainian language the negative form of the verb is stressed. The most emphasised member of the statement, i.e the predicate becomes the rheme of the utterance. The necessary information does not correlate with modal predicate plane of the utterance b [...]