In Shakespeare's plays, lower class characters often speak in free verse. This is an important distinction that reflects the social order of Shakespeare's time. At that time, the line between lower and upper classes was a well-defined one. Moreover, it was one that greatly affected all aspects of your life. Therefore, the use of free verse is a way in which Shakespeare reflects the real social differences between characters.
The correct answer is A Blank Verse. This kind of verse is defined as the one that does not rime with the other verses, but it keeps the rhythm and the measure of the stanza and because of this every single verse has a singular termination. Shakespeare liked to use this kind of verses since its resemblance with the common English language.
they often spoke prose or speech without good grammer
Explanation: shakespeare saw lower class people as dumb and without significance while the upper class he saw them as highly educated and obviously wealthy
with lower class characters generally speaking prose, and upper class characters speaking verse.