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This article is investigating analysis of grammatical categories including adjective, adverb, pronoun and numerals In English, Kyrgyz and Russian languages. Obtained results allow us to draw a number of conclusions based on analysis of paradigm, comparison degrees between adjectives and adverbs in the studied languages and shows that in the compared languages one can find isomorphic and allomorphic features in the way of expressing comparativeness. In English there are two suffix markers of comparison degrees of adjectives - er and - est, the role of which, apparently, is decreasing, since they are limited by structural framework of words and are increasingly being replaced by the analytic correlates more and most. In the Kyrgyz language, in addition to the affix - raak, there are case affixes (affixes of the original case - dan and dative case - ga), forming the name, the object of comparison and derivational affixes. Allomorphism in compared languages consists in the Kyrgyz language almost from all qualitative adjectives and adverbs form the comparative degree only synthetically, and the superlative degree only analytically, while in English the comparative and superlative degrees of adjectives and adverbs are formed both synthetically and analytically.