The article dwells on derivative causative verbs in English and Tajik languages. The author of the article adduces definitions of scientists concerned with the terms “causation”, “causative”, “causativeness”. It is noted that the category of causation in both languages is characterized as an interlevel category. In the article, discrepancies are found at the level of expression of causation. In English, the dominant levels are syntactic and lexical, and in Tajik, morphological. Derived causative verbs are formed with the help of affixation, alternation of letters, suppletiveness and zero morpheme. The name of derivative causative verbs is justified by the fact that they have a pronounced morphemic structure and causative affixes that are attached to the stem (in English -ify, -ise, -en, Ø, en-, dis- and others, in Tajik -on /-yon). At the morphological level, causation can be expressed through word-formation morphemes that act as a marker of causation.
causative derivative verb, morphological mode of expression, lexical mode of expression, affixal morpheme, derivational morpheme, formative morpheme, affixation, letter alternation, suppletiveness, zero affixation
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