"...Don Pedro of Aragon and his army are coming to Messina tonight"3.
"Look, it's my dear Lady desdain! Aren't you dead yet?"11.
"Would it even be possible to buy a jewel as rare and precious as Hero?"17.
Claudio and Benedick are coming home from fighting the war along with the army of Don Pedro.
"I'll disguise myself as you and pour out 'my' feelings to Hero"27.
Benedick and Beatrice are having a playful banter almost flirtatious. They are playfully making fun of each other.
"The Prince said that he is in love with Hero"29.
Claudio is in love with Hero on first sight and wants to marry her. He believes that she is the most beautiful women he ever lied his eyes on.
"...The Prince would court Hero tonight at the dance and, once he won her consent to marry, would give her to Claudio"37.
Claudio talks to Don Pedro to tell him that he is in love with Hero but he is bad at talking to women. So Don Pedro comes up with an idea to pretend that he is Claudio at a party to make a good impression and then switch back.
Antonio says that one of his servants overheard Don Pedro talk to Claudio and now Antonio thinks Don Pedro is in love with Hero.
Borachio knows the truth that Claudio is the one in love with Hero and is telling Don John what Don Pedro's plan is.