I explore the ongoing language change in which the impersonal modal word možno ‘can, be possible’ takes a personal clause (možno + nom) as its complement instead of the Experiencer in the Dative case (možno + dat) and the infinitival clause in the speech act of request in Contemporary Russian. The corpus-based evidence reveals that the construction možno + dat is gradually being replaced by možno + nom. I discuss various syntactic and pragmatic factors such as verb class, aspect, transitivity and politeness strategies that motivate the choice of a specific modal construction. Methods of statistical modelling, used to sort out the most significant factors contributing to the choice of construction, show that the most important factor is the date of creation of the text. I propose a scenario for the development of the možno + nom construction. First, možno began to be used as a tag-question after both infinitive and personal clauses. The requester marked by the Dative has been steadily replaced by the more agentive Subject in the Nominative case. Then, by analogy with the možno + dat construction, možno was placed at the beginning of the sentence and was reanalyzed as a constructional unit with the following structure: možno + finite clause, in which možno functions as a sentence adverb.

我探讨了正在进行的语言变化，其中非人称情态词možno 'can, be possible' 采用人称从句 ( možno  +  nom ) 作为补足语，而不是与格中的体验者 ( možno  +  dat)和不定式从句中的不定式从句。现代俄语中请求的言语行为。基于语料库的证据表明，结构možno  +  dat正在逐渐被možno + nom取代。我讨论了各种句法和语用因素，例如动词类、体、及物性和礼貌策略，这些因素促使选择特定的情态结构。统计建模方法用于整理影响结构选择的最重要因素，结果表明最重要的因素是文本的创建日期。我提出了一个开发možno +  nom结构的方案。首先，možno开始用作不定式和人称从句之后的标记疑问句。由与格标记的请求者已逐渐被主格中更具能动性的主语所取代。然后，类比možno  +  dat结构，将možno放在句首，并重新分析为具有如下结构的结构单元：možno  + 有限从句，其中možno充当句子副词。