主语从句 The dilemma is whether he should tell thruth to the patient or not作为主句 dilemma是主语 a doctor often faces 做从句修饰, 同位语:http://baike.baidu.com/view/409810.htm
he dilemma [a doctor often faces]其中的[]是宾语从句, 词句省去了引导词that 区分同位语从句和宾语从句关键在于引导词是否在从句中充当句子成分,如果充当就是定语从句,否则为同位语从句; 另外同位语从句的引导词一般不能省。 The fact that he has done this many times is known to everyone....
定语从句, 1.the dilemma that a doctor often faces =there is dilemma. A doctor often faces this dilemma. The dilemma (a doctor often faces) is whether he should tell thruth to the patient or not。