worth worthy worthwhile词义辨析

三个词的用法
worth 的用法
be worth sth
be worth doing sth这是主动表被动的用法。如这本书值得一读。The book is worth reading.

worthy 的用法
be worthy of sth
be worthy 后面如果跟动词的话，必须是被动语态。
be worthy of being done
be worthy to be done

worthwhile的用法
it is worthwhile to do/ doing sth.两者可互换
或to do sth./dong sth. is worthwhile

worth, worthy, worthwhile 都可以当做形容词来理解。
具体用法：
1. be worth sth.
e.g. The picture is worth $500.

be worth doing sth.
e.g. The car is worth repairing. (worth, 主动表被动)

2. be worthy of sth.
e.g. He is worthy of the name.名副其实

be worthy of doing (being done) sth.
e.g. The car is worthy of being repaired.
(注意此处区别于worth的用法)

be worthy of to be done.
e.g. The car is worthy of to be repaired.

3. it is worthwhile to do sth.
it is worthwhile doing sth.