请问如何区分 worth, worthy和worthwhile ？

这三个词都是形容词，都有“值得的”的意思，但用法或搭配关系不同。

1. worth是一个只能作表语的形容词，意思为“值……的”、“相当于……的价值的”、“有……价值的”、“值得……的”。由于它类似介词，须在后面接名词、或主动形式的动名词作宾语。例如：

This second-hand car is worth $2000 at the most.

The exhibition is worth a visit/visiting.

It’s not worth getting angry with him.

2. worthy可作表语，也可作定语。作定语时意思为“有价值的”、“值得尊敬的”、“应受到赏识的”；用作表语时意思为“值得……的”、“应得到……的”，其后接of sth.，也可以后接to do sth.，例如：

Guangzhou is worthy of a visit/ to be visited.

He said he was not worthy to accept such honour

The school has educated many worthy young people.

3. worthwhile与worthy一样，既可作表语，又可作定语。表示某事因重要、有趣或受益大而值得花时间、金钱或努力去做，一般做“值得的”、“值得做的”、“有意义的”解。用作表语时，可接动名词或动词不定式。例如：

The Summer Palace is worthwhile going / to go to have a visit.

Helping old people is a worthwhile activity.

Thank you for your worthwhile suggestion.

worth:
prep.
相当...价值
n.
价值, 财产,例如：her net worth， 她的实际财产
adj.
值钱的, 值的看中的，例如：a proposal not worth consideration，
不值得考虑的提案

worthy:
n.
杰出人物, 知名人士
adj.
有价值的, 应...的, 可敬的, 值得的, 相称的, 例如：a worthy fellow.
可敬可佩的人

worthwhile:
adj.
值得做的, 值得出力的, 例如: the investment is so worthwhile, 这个投资非常值得

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.