Othello: Put away your bright swords for the dew will make them rust.
Act 2 Scene 3
Montano: Come come you are drunk
Cassio: Let me go sir, or I'll hit you on the head !
Act three Scene 3
Emilia: I'm glad I've found this handkerchief it was her first keepsake from the Moor.
This is the first time Brabantio and Othello meet after Brabontio finds out that he want's to marry his daughter Desdemona. This is Othello asking Barbantio of he can marry his daughter. So right now there is a lot of tension between the two of them.
Act four Scene
This is showing us just how influencing Iago's words can get. Also the reason that Cassio isn't acting normal is because he is drunk. At the end of there conflict Cassio ended up stabbing Montano when they were fighting. By Cassio doing this he lost his respect.
Act five Scene
Emilia find a handkerchief on the floor and know's that the moor gave it to Desdemona as a weeding gift. So Emilia decides to steal it for Iago's evil plan because he asked her to. She know's that this is wrong of her but choose her loyalty to her husband over her loyalty to Desdemona.