Here's why:
* Proper Nouns: These are specific names of people, places, or things. They are always capitalized. Examples: John, London, Earth, Amazon River, Mount Everest.
* Pronouns: These are words that stand in for nouns. They don't refer to specific things, but to general categories. "He", "she", "you", and "me" are pronouns.
* "Are" is a verb, a word that describes an action or state of being.
Let me know if you'd like some examples of proper nouns!