Final answer:
Lady Macbeth greatly influences Macbeth by manipulating him into committing regicide to fulfill their ambition for power and royalty.
Step-by-step explanation:
Lady Macbeth greatly influences Macbeth in William Shakespeare's play Macbeth. She manipulates him into committing regicide by questioning his masculinity and ambition. For example, she challenges his courage and persuades him to kill King Duncan to fulfill their ambition for power and royalty. Lady Macbeth's influence is evident in her speech and actions throughout the play, as she pushes Macbeth to act upon his darkest desires.