What possible reason do some characters speak in prose and verse?

* Stylistic choice: The author may choose to have some characters speak in prose and others in verse to create a sense of contrast or variety in the language of the play. This can be done to emphasize the differences between characters, to create a particular atmosphere, or simply to add a touch of artistic flair to the play.

* Character differentiation: Characters who speak in prose may be seen as more down-to-earth and realistic, while characters who speak in verse may be seen as more poetic and elevated. This can be used to create a hierarchy of characters or to highlight the different social or cultural backgrounds of the characters.

* Dramatic effect: The use of verse can create a sense of heightened emotion or drama. This can be effective in moments of high tension or conflict, or to emphasize important speeches or moments of revelation.

* Cultural context: The use of verse may be influenced by the cultural context of the play. In some cultures, verse is traditionally used in certain types of drama, such as tragedies or historical plays. This can help to create a sense of authenticity or to evoke a particular cultural atmosphere.