What part of speech does the words in capital letters play this sentence hey they opened cafeteria early Today for breakfast?

Let's break down the sentence and identify the parts of speech for the capitalized words:

* Hey - This is an interjection. It's a word that expresses emotion or a sudden outburst.

* They - This is a pronoun. It stands in for a noun (in this case, the people who opened the cafeteria).

* Today - This is an adverb. It modifies the verb "opened," telling us when the cafeteria was opened.

* Breakfast - This is a noun. It refers to the meal being served.

Let me know if you'd like to explore parts of speech further!