On the semantic subject in the Russian sentences of the type "можно идти" in comparison with their Polish equivalents

The semantic subject is an element of the predicative-argumentative structure. It denotes a performer of an action or a bearer of a feature that is expressed by the predicate. The semantic subject can be conveyed explicitly in the form of the dative case in the impersonal sentences of the type Можно идти. It can also appear from the context or remain unnamed due to meaning generalization or the absence of information concerning its referent