Shakespeare's Structures of Athello and Desdemona

Act I've seen one of Athello is a night scene with Iago and Rodrigo rousing the sleeping Senator Brabantio. The Duke's servant summoning Athello for a conference about Cyprus. A sardonically rhyming exchange makes the place equivalence between the elopement between the Moore and the Venetian on the one hand and the threat to theVenetian property by the Turks on the other. People in early Shakespeare's plays often rhyme, end rhyme, you know blank verse what's blank about blank verse is that it doesn't rhyme.