He sees a dagger floating in the air in front of him. He concludes that it must be a "dagger of the mind", a hallucination.
It gives the impression that Macbeth is superhumanly evil, as if he were the devil.
Where is Macbeth going when he sees the bloody dagger?
They predict that he will become king. Or rather, the last one does. Each one hails him by a different title.
The crucial part. Without Lady Macbeth, this would have been Macbeth's final decision: "We will proceed no further in this business." Macbeth would never have killed Duncan unless Lady Macbeth had goaded him into it.
"Come, let me clutch thee. I have thee not, and yet I see thee still."
killing king duncan (:
art thou afeared / to be the same in thine own act and valour / as thou art in desire?
He is complex, with both good and bad qualities.
Duncan is such a good and popular king; it would be cruel to kill him and make the country sad.
that he wont be strong enough to kill the king and further his own ambitions