Let's break down the components:
* Cuáles: This word means "which ones" in Spanish. It's the plural form of "cuál".
* Son: This is the third person plural form of the verb "ser" meaning "are" or "to be".
* Formal: This refers to a style of language or behavior that is appropriate for serious situations and interactions with those you don't know well. It might involve using formal titles, polite expressions, and avoiding slang.
* Informal: This refers to a more relaxed and casual style of language and behavior, typically used with friends, family, or people you know well. It might involve using slang, contractions, and a more relaxed tone.
So, the question "Cuáles son formal y informal?" is asking to distinguish between formal and informal words, phrases, or expressions within a given context.
Example:
Imagine you're learning Spanish and you're presented with a list of greetings. The question "Cuáles son formal y informal?" would be asking you to identify which greetings are appropriate for formal situations (like meeting a professor) and which ones are appropriate for informal situations (like talking to a friend).