iago again goes to work on the hapless roderigo this time insinuating that desdemona is in love with cassio what arguments does he use to convince roderigo of this

Iago is a master of temptation; he is able to figure out exactly what people want, and then drive them to it, often by his mastery of speech. He is able to persuade Roderigo of Cassio and Desdemona's attachment by painting an innocent gesture as a sign of familiarity; yet, all the power that is in his words is in their interpretation, for Iago is also able to say everything and nothing at once, depending on the inclination of the hearer.