( Must you - Do you have to ) smoke a cigarette in here? The window is locked.
I go for 'Must you' because this sentence suggests that an annoying thing is happening now, and this makes the speaker annoyed. However, my friend says 'Do you have to' is correct too. Is he right?
Both are fine. "Must you" sounds more British to me. Americans would more likely use "Do you have to".
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Both are fine. "Must you" sounds more British to me. Americans would more likely use "Do you have to". So it depends what variety of English you're learning. The meaning is the same either way.
CJ