Final answer:
Juliet's mind is fraught with fears as she prepares to take the potion: that it won't work, that she'll wake early in the tomb, that she'll encounter Tybalt's ghost, and that it might be poison.
Step-by-step explanation:
In William Shakespeare's tragedy Romeo and Juliet, as Juliet prepares to take the potion, many fears crowd her mind. Notably, she fears that the potion might not work at all, which would leave her to marry Paris. She also fears waking up too early in the tomb and being trapped with the bodies of her ancestors and the fresh corpse of Tybalt, which could drive her mad. Additionally, Juliet worries about encountering Tybalt's ghost in the tomb seeking revenge on Romeo, who killed him in a duel. Lastly, she harbors the fear that Friar Lawrence might actually be trying to kill her to cover up the secret marriage, and thus the potion could be poison. Each of these thoughts underscores Juliet's isolation and desperation in the face of the tragic circumstances that have befallen her and her lover, Romeo.