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Questions & Answers about ¿Qué tapas tenéis?
Why use Qué instead of Cuáles when asking about plural tapas?
In Spanish, we always use qué when the question word comes directly before a noun, even if that noun is plural. So qué tapas translates to "what tapas" or "which tapas". You would only use cuáles (which ones) if you drop the noun entirely, for example: ¿Cuáles tenéis? (Which ones do you guys have?).
Who is doing the action in the verb tenéis?
Why isn't the pronoun vosotros included in the sentence?
Because the verb ending -éis in tenéis already makes it perfectly clear that the subject is vosotros. In Spanish, you usually drop the subject pronoun unless you need to add special emphasis or clear up a misunderstanding.
How does this compare to asking ¿Qué tapas hay?