Old sport! I've read the book and seen the movies
Answer: Capulet does not know that Juliet is actually alive.
Dramatic irony occurs when the audience knows something that the characters of a narrative are unaware of. In this case, the lines are an example of dramatic irony because Capulet believes Juliet to be dead. However, the audience knows that Juliet has taken a potion that makes her appear dead, but that, in fact, she is alive and plans to escape with Romeo.
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