Infinitive, as a component of language, constitutes a basic form of verb in different languages. The study of infinitive from the perspectives of lexical structure and syntactic features attracted the attention of researchers as it is found in syntactic structures of both written and spoken discourse. This study examined the syntactic features of infinitive in Farsi and in Russian in order to find their similarities and differences in these two languages. The results show that on the bases of the syntactical features, infinitive can be regarded as a verb in Russian, whereas it is similar to noun in Farsi.
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