Soothsayer tells Ceasar to beware the Ides of March. This is important because it foreshadows Caesars fall. Caesar mostly ignores this warning. On this day Caesar goes about his normal actions. "Beware the Ides of March." (I, ii, ln 18)
Act IV Scene 3
Brutus joins the conspiracy. All of the men go over to his house in the middle of the night. After Brutus joins they all go over to Caesar's house to take him to the capitol. This is important because without Brutus the conspiracy probably wouldn't have been as successful in their actions. "Give me your hands all over, one by one." (II, i, ln 112)
Act V Scene 3
Caesar's ghost is still strong.
Caesar goes with the conspiracy to the capitol. Caesar is killed by the conspiracy with daggers. Antony then runs home scared. This is very important because without this there would be no action or climax in this story. "Speak hands for me!" (III, i, ln 78)
Et tu,Brutè? Then fall, Caesar.
Brutus sees Caesar's ghost. The ghost says he will see Brutus at Philippi. Brutus becomes scared and is ready for the battle. Brutus tells his army to go to Philippi to meet Antony. "Go and commend me to my brother Cassius;/ Bid him set on his pow'rs betimes before,/ And we will follow." (IV, iii, ln 305-308)
We shall go to Philippi!!
Cassius kills himself. Brutus finds Cassius and some others dead. Brutus says Cesar's ghost is still alive and strong. This is important because Caesar's ghost has altered others actions and caused unnecessary deaths. "O Julius Caesar, thou art mighty yet!/ Thy spirit walks abroad, and turns our swords/ In our own proper entrails. (V, iii, ln 94-96)
You can't trust anyone too much. Brutus stabs Caesar even though they were close friends. Caesar trusted Brutus. Behind Caesars back Brutus turned against him. This resulted in Caesars death. "Et tu,Brutè? Then fall, Caesar." (III, i, ln 79)