worth 的用法

worth,worthy,worth-while都为adj. 意为"值得".
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 sth
It is worth while sb to do sth.