In Act I: Sc 2 The Soothsayer warns Caesar about the ides of March. This is the first warning from the Soothsayer. Brutus is with him in this scene. This is important because it's the beginning of the conflict. (I-ii-18) Soothsayer- "Beware the ides of March".
Act IV: Sc 3
In Act II: Sc 2 The conspirators are telling Brutus about their plan. They're trying to recruit Brutus. They need help with their plans. "And let us swear our resolution." stated by Cassius in (II-i-113)
Act V: Sc 5
In Act III: Sc 1 The plan gets put into action. Everyone is distracting Caesar and helping the plan. The when the time is right they all start stabbing Caesar and kills him. ¨Et tu, Brute? Then fall, Caesar.¨ (III-i-28) This is important because they completed their plan.
In Act IV: Sc 3 Brutus sees a ghost. The ghost is the ghost of Caesar. And Brutus is confused when Brutus tells him something that is not really clear. ¨To tell thee thou shalt see me at Philippi.¨ (IV-iii-283) Then the ghost leaves.
In Act V: Sc 5 It is near the end of the battle. Many people have died and now the story is focused on Brutus. Brutus is dying and says his last words. ¨Farewell, good Strato-Caesar, now be still; I killed thee with half so good a will.¨ (V-v-80) This is basically the end of the story.
In Act I: Sc 2 The Soothsayer tries helping Caesar. He warns Caesar about he ides of March. ¨Beware the ides of March.¨ (I-ii-28) I think this helps the theme by saying dont push away people all the time because they could help you.