I say, it is not lost. Why, so I can sir, but I will not now. This is a trick to put me from my suit. Pray you, let Cassio be received again. (III.iv.82-85)
Fetch me the handkerchief-- my mind misgives. The handkerchief! (III.iv.86-89)
Look how he laughs already! (IV.i.107)
I marry her! What? A customer? Prithee bear some charity to my wit. Do not think it so unwholesome. Ha, ha, ha! (IV.i.116-118)
Why the cry goes that you shall marry her. I am a villain very else. (IV.i.120-122)
(Othello falls into a trance)
Lie with her? Lie on her? We say lie on her when they belie her! Lie with her--that's fulsome. Handkerchief--confessions --handkerchief! (IV.i.34-36)
(aside) Work on, my medicine, work! Thus credulous fools are caught, and many worthy and chaste dames even thus, all guiltless, meet reproach. (IV.i.42-44)
(III.iv.54-94) The conflict shown above is a problem between two characters, Desdemona and Othello, meaning that it is man vs. man. The lovers have many misunderstandings at this point in the drama between them, which contributes to Iago’s revenge and tears their love apart. The building tensions are a result of Iago’s suggestions of Desdemona’s unfaithfulness, but since Desdemona does not know this, she continues to bring up the matter of reinstating Cassio as Othello’s lieutenant. Othello’s anger about the loss of the handkerchief both surprises her and confuses her, since in her eyes, she has done nothing wrong. Yet to Othello, he sees her actions as signs that she betrayed her, creating a conflict. In addition, as she continues to mention Cassio, he becomes increasingly angry, since they are reminders of Iago’s warnings about Cassio being too close to Desdemona, as he does not want these suspicions to be true. This event propels the plot by providing Othello the “proof” he needs to show that Iago did not lead him astray, and that he spoke the “truth” when he accused Desdemona of the crime. In other words, it helps build Othello’s trust in Iago. It inflames Othello’s jealousy because he sees his wife caring for Cassio, the man he believes is her partner in crime, which only makes him suspect Cassio even more. And it only makes Othello angrier when she “acts” innocent, since he thinks that Desdemona’s inability to present the handkerchief is the evidence he needs to conclude that she was disloyal. As Othello doubts Desdemona, it makes him more willing to kill her, thus ruining his life by ruining his marriage, as Iago wishes.
(IV.i.100-136) In the scene shown above, Othello is shown hiding while Iago is supposedly making Cassio confess to sleeping with Desdemona, when in reality, it is one of Iago’s elaborate manipulations. This is one of Othello’s external conflicts, man vs. man, because the problem is between two characters, Iago and Othello, in which Iago is trying to further provoke Othello into ruining his own life for his master plan of vengeance, which is ironic because Othello still thinks of Iago as a friend. Iago’s plan consists of ruining Othello’s newfound happiness, by trying to trick him into killing his own wife. The conflict impacts the drama by contributing to Iago's revenge. Othello becomes even more angry and jealous of Cassio as he sees how easily Cassio laughs at something Othello deems so important, his wife, whom he thinks Cassio is laughing at, when in actuality, he is laughing at Bianca. This leads Othello to think irrationally and misinterpret the situation. Iago knew Othello would react in this manner, allowing him to solidify his plans, since it rids Othello of any hesitancy by amplifying his feelings of insecurity of his race and jealousy at those who seem to have more than him, like Cassio, who is a handsome smooth talker. Othello believes he heard Cassio confess to adultery, ultimately leading him down a path of self destruction. Whereas Othello still had the smallest amount of doubt that Desdemona would never do such a thing before this moment, Othello views this response from Cassio as absolute proof that Cassio and Desdemona had betrayed him.
(IV.i.34-45) The crisis shown above is an internal conflict, in which Othello is torn over his love for Desdemona and her “unfaithfulness”. He fights with himself, debating what he should believe, showing that it is man vs. self. Previously, he heard two different judgements of Desdemona, one good and one bad, resulting in Othello arguing with himself over whether or not to trust his wife. He so anguished and overwhelmed by his situation that he falls into a trance and loses sight of reality. It contributes to the drama by showing Othello’s doubt towards Desdemona and Cassio. It also plays a role in Iago's revenge because this is exactly what he hoped to achieve, to create suspicion to tear Othello's happy life apart, and it tells Iago that his plan is moving in the right direction. In his trance, Othello states,”First to be hanged, and then to confess-- I tremble at it,” showing that Iago is effective in his manipulations, and also confirming that Othello wishes to kill Cassio, which moves the plot forward by creating suspense.