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Answer:
When Macbeth hears the sisters talk to him as if he were Thane of Cawdor, and also he's called that from the future king. He is shocked and speechless. But when he learns that he was actually named Thane of Cawdor, he decides to accept it and believes the witches are right on whatever they say. So, he starts to imagine that he can murder the King. He knows that is just his imagination or a fantasy, so it's not really important to him.