Final answer:
When speaking to a single person, use 'tú'. When speaking to someone in authority or unfamiliar with, use 'usted'. When speaking to multiple people, use 'ustedes'.
Step-by-step explanation:
When speaking with these people you would use the following subject pronouns:
- la maestra de español - usted
- tu amigo - tú
- dos amigos - ustedes
- el señor López - usted
- los padres de tu amigo - ustedes
- tus amigos José y Paco - ustedes
- el doctor García - usted
- tu mamá - tú
When speaking to a single person, you would use the pronoun 'tú' for familiar individuals like your friend or your mom. However, when speaking to someone in a position of authority or someone you are not familiar with, like the Spanish teacher or Mr. Lopez, you would use the pronoun 'usted'. Finally, when addressing more than one person, like two friends or your friend's parents, you would use the pronoun 'ustedes'.
Learn more about Subject pronouns in Spanish