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1. worth: be worth + n. 当名词为金钱时,表示""…… 值得……""be worth doing sth.""……某事值得被做""The question is not worth discussing again and again.2. worthy:be worthy of +n.当名词为抽象名词时表示""……值得……""be worthy to be done ""某事值得被做""The question is not worthy to be discussed againand again.3. worth-while: be worth-while to do sth ""值得做某事""worth while: It is worth while doing sthIt is worth while sb to do sth.典型例题It is not ____ to discuss the question again and again.A.worthB.worthyC.worth-whileD.worth while答案C. 由worth的用法可知,此句只适合词组be worth-while to do sth.