This article analyzes 'accusativus cum infinitive' (AcI in sequel) constructions with verbs of perception in Czech, and briefly mentions the occurrence of these constructions in other Slavonic languages. The focus is placed on the syntactic and semantic features of these Czech constructions and their relationship to their respective paraphrases (expressed by subordinated clauses). The relationship between grammatical coreference (obligatory with the AcI and only optional with the analyzed subordinated clauses), the broad possibility of word-movements in the AcI and the limited one in subordinated clauses are used as arguments for the special position of the AcI within the underlying structure of the sentence, unlike the structure of semantically close subordinated clauses.
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