This is the 3760th most frequent Polish word.
michael
The Polish word "michael" does not exist; it seems to be a proper noun, equivalent to "Michael" in English.
Michael acts as the subject of the sentence, being the one who performs the action of loving to play the piano.
Michael uwielbia grać na pianinie.
Michael loves playing the piano.
Michael functions as the subject being inquired about and placed in locational context - the library.
Czy Michael był w bibliotece wczoraj?
Was Michael in the library yesterday?
Michael is the direct object here, the recipient of the invitation.