The best examples that come to mind are when ordering food. As examples:
• You speak English and Spanish and are ordering a burrito
• You speak Thai and English and are ordering Tom Yum
I imagine it could depend on numerous things:
• You primary language or ethnicity
• What sort of restaurant
• Who you’re dining with
• Who you’re ordering from
• and probably a lot more…
Depends , if I’m speaking with my wife we interchange and speak whatever comes in the moment and understand each other. In other countries we use the native language if we know it.
With friends it depends if everyone in the group can speak the language or not.