The Play opens with the discussion between Iago and Roderigo, the scene is set on the streets of Venice. Iago is the most important general to Othello and he is furious because he hasn't appointed as Othello's tenent.

Roderigo is a noble and he decided to collaborate with Iago because he felt in love with Desdemona (Othello's wife). So Iago and Roderigo look Othello as an enemy and they decided to ally against him.

Considering the first exchange by Iago the reader can discover that there is a strong language (as "Sbllod") and it helps to create an emotional coinvolgiment. In Iago's first affermation the subject is posed after a deviation.

The subject pronoun "I" brings great strenght to Iago's exchange because is ina a central position followed by the alliteration "did dream".

Right from the first exchange, Iago uses the language of a self assured character, he wants to convince his  confident that his suspects are pure fantasy. The semantic content between "Dream" and "matter" not only underlines the content between apparence and reality but it also make the intelligent audience persuade that roderigo's suspects are pure fantasy, for this purpuose Iago uses several linguistic devices, he create cronological distance using "If ever", he exploied the verbal energy or comunicative strenght edit by the alliteration and last but not list he uses "such a matter". In the end the lissener is almost convince that Roderigo seems to have seen ghost. 

The second exchange by Iago is longer than the first exchange...