I've just started to learn German, and I encountered this sentence:
Was isst du am liebsten?
The translation, according to he video that I'm learning from, is
What's your favourite food?
But as far as I know du is a personal nominative pronoun for the 2nd person; and based on my limited and superficial knowledge, I expected to see deine, the possessive pronoun form for the 2nd person, here. Is there an explanation for this?
On asking similar questions about the interests of others, how should I know when I should use du or deine?
Is it possible to form a question/sentence in German, without having something represented as nominative case in it?