Spanish phrase
¿Debo usar tú o usted?
Meaning
Should I use the informal form of address instead of the formal one?
When to use it
Asks whether to use an informal or a formal form of address. Used to confirm the appropriate level of politeness based on age and social rank.
Example dialogue
¿Oye, debo usar tú o usted?
Hey, should I use the informal form of address instead of the formal one?
Conmigo puedes usar tú, pero con el profesor usa usted.
You can use the informal form with me, but use the formal form with the professor.