BLANK VERSE

Blank verse is not the same as free verse which has no set rules.
Blank verse is unrhymed iambic pentameters.
Unrhymed means that there is no rhyme at the end of the lines, although Shakespeare frequently adds rhyme at the end of a scene to show that it is the end.
Iambic means that each foot (little bit of the rhythm) reads like the word again.with a weak stress followed by a strong stress.
Pentameter means that there are five of these feet in each line
Therefore a line of blank verse reads as though you are saying the word again five times:
Again, again, again, again, again.