Final answer:
Different subject pronouns are used based on the person you are talking to in Spanish.
Step-by-step explanation:
1. When speaking to your cousin Roberto in Spanish, you would use the subject pronoun 'tú'.
2. When speaking to your friends (m) in Spain, you would use the subject pronoun 'vosotros'.
3. When speaking to your friends (m) in Latin America, you would also use the subject pronoun 'ustedes'.
4. When speaking to your instructors, you would use the subject pronoun 'ustedes' as well.
5. When speaking to the store clerk, you would use the subject pronoun 'usted'.
6. When speaking to your friend in Spain, you would use the subject pronoun 'tú'.
7. When speaking to your friend in Latin America, you would use the subject pronoun 'tú' as well.
Learn more about Subject pronouns in Spanish