This is an example of cultural studies because in certain cultures these phrases can mean different things and its teaching you how to avoid cultural differences in certain situations Top 10 Phrases to Never Say in French [Cheat-Sheet]
There are 16 verbs in French that require être rather than avoir in the passé compose. Sometimes there is a passé. Passé uses être to talk about physically passing by something. These irregular verbs also must agree in gender and in number.