Final answer:
The witches predict that Banquo's offspring will become kings, but Banquo himself will not be king.
Step-by-step explanation:
The witches predict for Banquo that his offspring will become kings, although he himself will not be a king. In the text of Macbeth, the witches address Banquo with a prophecy stating, “Thou shalt get kings, though thou be none.” This indicates that Banquo's descendants will have a royal future, but not Banquo himself. This prophecy contrasts with what they predict for Macbeth, who they say will become king and Thane of Cawdor.