worth,worthy 与 worthwhile有什么区别?

Worthwhile (adj) 值得的
worthwhile 用于下列句型：
It is worthwhile doing sth./ to do sth.干某事是值得的
但不能说：sth.is worthwhile doing/ to do
长城值得去旅游.It is worthwhile visiting/ to visit the Great Wall.
worth 用于下列句型：sth.is worth sth/ doing
此句型中只能用doing,不能使用被动.
The museum is certainly worth a visit.=The museum is certainly worth visiting.
这个博物馆的确值得参观.
This idea is well worth considering.这个想法很值得考虑.
worthy 用于下列句型：sth.be worthy of sth/ being done sth.be worthy to be done
这部电影值得看.The film is worthy of being seen.= The film is worthy to be seen.