How can I be Thane or King when those positions are already occupied?
The Killing of King Duncan
I have mudered sleep...
The Killing of Banquo
We have not done our job... Fleance has escaped
Three witches meet on a heath in Scotland. They give Macbeth and Banquo prophecies. Macbeth's prophecies are that he is the Thane of Glamis, will be the Thane of Cawdor, and will become King. Banquo's prophecies are that he will be lesser than Macbeth and greater, not so happy yet much happier, and he will father kings but not be one himself. These prophecies greatly impact all of the characters and their roles in the play.
Macbeth and Lady Macbeth invite King Duncan to their castle for a gathering in plan to kill King Duncan while he's sleeping. Lady Macbeth gets the guards of Duncan's room so drunk that they pass out. This gives Macbeth the chance to get in and go forward with the killing. Macbeth takes the dagger from one of the passed out guards and uses that for the attack. Macbeth now goes in and stabs Duncan. The whole reason he does the killing is to get closer to becoming King.
The Killing of Macbeth
All hail the King of Scotland!
To proceed Macbeth's road to King, he realizes he has more killings to do; he needs to kill Banquo and Fleance. He needs to kill both of them because of the further line of kings. Banquo especially needs to be killed because he would be next in line to take the position of king and then his own would later on. Macbeth hires three murderers to do the dirty work because he doesn't want to do thee killing himself to keep certain loyalties to their mutual friends. This killing was done when Banquo and Fleance were riding horses to the banquet. At this time, the murderers kill Banquo but Fleance escapes. Macbeth becomes angry and begins to lose his mind.
Later on, Macbeth receives apparitions. His first apparition was from a head with a crown that says to beware of the Thane of Fife (Macduff). His second apparition was from a blood covered child that says no one can harm Macbeth that is born from a woman. The third apparition was from a child wearing a crown holding a tree and says Macbeth will not be killed until Birnam Woods advances against him. Lastly, the witches show Macbeth eight kings that look like Banquo as well as a blood covered Banquo. These apparitions are very important to the end of the play and hold a big role in Macbeth's death.
Fear the Thane of Fife Macbeth!
More and more are finding out about what Macbeth has done. In the beginning of this act, Lady Macbeth is caught sleep walking and she begins to talk about all of the people Macbeth has killed. This soon spreads throughout Scotland and the Thanes, Malcolm, Siward, and Macduff gather to fight Macbeth. They meet in Birnam Woods with the 10,000 soldiers and begin picking up branches of the trees and carry them to Macbeth. When they all meet with Macbeth, Macbeth first fights with young Siward and ends up killing him. This gives Macbeth some reassurance that the apparitions are true. When Macbeth fights Macduff he hesitates because he already killed Macduff's family. Macduff ends up killing Macbeth. The apparitions still remain true because Macduff was actually born from a c-section. The act ends with Macduff bringing Scotland Macbeth's head on a stick, and Malcolm takes the position of the King of Scotland.