Final answer:
The wife of the Thane of Fife is Lady Macduff. Lady Macbeth is married to Macbeth, the Thane of Cawdor and later King of Scotland, while Hecate is not married to any thane in the play.
Step-by-step explanation:
The wife of the Thane of Fife is Lady Macduff. In Shakespeare's play Macbeth, Lady Macbeth is the wife of the main character, Macbeth, who becomes the Thane of Cawdor and later the King of Scotland. On the other hand, Lady Macduff is married to Macduff, the Thane of Fife, and appears in the play as a contrast to Lady Macbeth, representing domesticity and maternal virtue. Lady Macbeth is a pivotal character whose ambition and actions are central to the play's plot, pushing Macbeth to commit regicide to become king. However, Lady Macduff is portrayed as a victim of Macbeth's tyranny and appears in scenes showing the consequences of Macbeth and Lady Macbeth's ambition.