Here are some examples of how "as" is used:
* Preposition: "She walked as fast as she could." (Comparing speed)
* Conjunction: "I'll do it as soon as I finish this." (Indicating timing)
* Pronoun: "The suspect was apprehended as they were leaving the building." (Referring to the suspect)
If you're looking for a verb that means "to act like" or "to assume the role of," you might use "play" or "act":
* "He played the role of the villain."
* "She acted as if nothing had happened."
Let me know if you have any other questions or want to explore more ways to use different parts of speech!