1. Tu vs. Vous and Register in Spoken French (Level 1)
French listening rejoinders hinge on recognizing the register (formal or informal) embedded in a single spoken line, since the ``correct'' response must match that register, not just the topic.
tu = informal/singular (family, friends, children, peers); vous = formal/singular OR any plural. Register markers: ``Comment allez-vous ?'' (formal) vs. ``Ça va ?'' (informal); ``Vous permettez ?'' vs. ``Je peux... ?''
Don't confuse vous-plural (addressing a group of friends, still informal in tone) with vous-formal (singular, polite distance) --- the verb form is identical but the appropriate rejoinder differs.
A rejoinder answer built with ``tu'' forms is often planted as a distractor when the prompt uses ``vous'' formally --- test-takers who react to content but ignore register pick the wrong option.
tu = close/informal $arrow$ vous = polite/plural $arrow$ match the register, not just the meaning.