Final answer:
Lady Macbeth's soliloquy serves several dramatic purposes: providing insight into her thoughts and feelings, giving a vivid picture of her personality, and illustrating a contrast with her husband.
Step-by-step explanation:
Lady Macbeth's soliloquy in Act I of The Tragedy of Macbeth serves several dramatic purposes. First, it gives the audience insight into Lady Macbeth's thoughts and feelings, revealing her ambition and desire for power. Second, it provides the audience with a vivid picture of Lady Macbeth's personality, showing her willingness to do anything, including committing acts of cruelty, to achieve her goals. Finally, the soliloquy illustrates a key contrast between Lady Macbeth and her husband, as she is portrayed as more ambitious and ruthless than Macbeth himself.