Final answer:
The subject pronoun that you would use to address two classmates in Spanish is 'ustedes'.
Step-by-step explanation:
The subject pronoun that you would use to address two of your classmates in Spanish is ustedes. This pronoun is used to refer to a group of people in a formal or polite way. For example, if you want to address two classmates who are shy, you could say 'Ustedes son tímidas'.
Learn more about Spanish subject pronouns