Caesar defeats Pompey's sons in battle. This gets Caesar close to being king. Because he is closer to king Cassius decides it is time to strike. This is the most important part of Act I because it is when Cassius decides to kill Caesar. "But indeed, sir, we make holiday to see Caesar and to rejoice in his truimph." (II:i:Ln31-33)
Act IV Scene iii
You shall see me in Philippi
Brutus agrees to help kill Caesar. This makes the conspiracy far closer to killing Caesar because everyone loves Brutus. Brutus will convince the people that Caesar must die. "Give me your hands all over, one by one." (II:i:Ln112)
Act V Scene v
He was the noblest roman of them all
The conspirators kill Caesar. This is important to the story because the conspirators finally complete their plan. This is the most important part of this act because Caesar dies and this starts the war between Antony and the conspirators. "Tyrany is dead" (III:i:Ln78)
The ides of March have come. Yes but they are not gone.
Caesar's ghost comes to Brutus in his tent. This is important because it makes The armies go to Philippi early. This is the most important part of act IV because it is the reason that everyone will die. "To tell thee thee shall see me at Philippi." (II:iii:282)
When Brutus is found dead Antony says " he was the most noble roman of them all" (V:v:68). this is the most important part of the act because everything is peaceful and the war is over. This it important to the story because the conflict is resolved. It finally shows that everyone knows how noble and kind Brutus is.
When the soothsayer and Caesar are talking I think it shows the theme well. I think so because the theme to me is to not be arrogant and oblivious because if Caesar was not arrogant he would have listened to the soothsayer. And if he was not oblivious he would have noticed something was up. "The ides of march have come. Ay, Caesar but not gone." (III:i:1-2)