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…
I’m Chinese-American. Primary language is English, I don’t speak Cantonese very well, and I don’t really speak Mandarin (but both are based on the same language system so its not that hard to convert from Cantonese). If I were to go to a Chinese restaurant, I’m gonna speak, in this order: Cantonese, then its Mandarin, then English, but most of the staff probably speaks Cantonese. I’m not gonna be like “I want a 燒賣, thank you”, like… that sounds so out of place lmfao, just speak the whole thing in the same language.