why do you always look so tired?这是定语从句吗?

why do you always look so tired?这是定语从句吗? -why do you always look so tired? .—why,Jack,you look so tired! why do you look so happy?是一般现在时吗? -Why do you look so tired?-There are so many problems___ Why do you look so tired?I stayed(.)the whole night Why do you look so tired?-----We have just returned from ___ Why are you always tired,do you know? ．—Why,Jack,you look so tired! -You look so tired today.-so I___A am B do Why do you look so upset -----Sally,why do you look so unhappy?