Yes or no question and affirmo-negative question

I already knew both of the question forms but I didn‘t realized that there is a difference between them.

Normally we can ignore the difference between these two kind question. Let's have a look of the answers of these two questions. 1 Yes or no question 你(nǐ)喝(hē)咖(kā)啡(fēi)吗(mɑ)？（Do you drink coffee?) 喝(hē)/不（bù）喝(hē) or是（ shì）/不是（ búshì）[yes/no] 最(zuì)近(jìn)你(nǐ)忙(mánɡ)吗(mɑ)？(Are you busy recently?) 忙(mánɡ)/不（bù）忙(mánɡ)or 是（ shì）/不是（ búshì）[yes/no] In Yes or no question we can use repeating verb or adjective and yes or no to answer question. But in affirmo-negative question, we must choose affirm or negative form to answer and can't use yes or no. 你(nǐ)喝(hē)不(bu)喝(hē)咖(kā)啡(fēi)？(Do you drink coffee?) 喝(hē)/不（bù）喝(hē) 最(zuì)近(jìn)你(nǐ)忙(mánɡ)不(bu)忙(mánɡ)？(Are you busy recently?) 忙(mánɡ)/不（bù）忙(mánɡ) The answer can't be 是（ shì）/不是（ búshì） In Chinese people can repeat the verb or adjective to mean yes or no.However Chinese people prefer to repeat verb or adjective to indicate yes or no. That's why there is no big difference between these two kinds of questions.