Yes or no question and affirmo-negative question
1yes or no question
你(nǐ)喝(hē)咖(kā)啡(fēi)吗(mɑ)?(Do you drink coffee?)
最(zuì)近(jìn)你(nǐ)忙(mánɡ)吗(mɑ)?(Are you busy recently?)
2affirmo-negative question
你(nǐ)喝(hē)不(bu)喝(hē)咖(kā)啡(fēi)?(Do you drink coffee?)
最(zuì)近(jìn)你(nǐ)忙(mánɡ)不(bu)忙(mánɡ)?(Are you busy recently?)
These two kind of questions' English translations are same and they are used in the same way. Seldom Chinese people can tell the difference between these two kinds questions. But if you pay more attention, you can find out a very little difference between these two sentences.
Please have a try!
(Hint:the difference is in the answers.)