Here's why:
* Verbs describe actions or states of being. "Captivate" means to attract and hold someone's attention.
* Past participles are a form of the verb that can function as an adjective, part of a verb phrase, or even a noun.
In a sentence, "captivated" can be used in various ways:
* Adjective: "The audience was captivated by the performance."
* Part of a verb phrase: "She has been captivated by the story."
* Noun: "The captivated audience gave a standing ovation."