It is worth trying.这里的worth是介词吗

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.

两种理解
介词或者形容词
我一直理解是介词+doing
但是现在查字典发现还有一种形容词理解
把worth看做少数必须有补语才能成立的形容词，那么doing其实做的事形容词补语。

是形容词，
但固定用法为be worth doing或be worth sth.

这个重要吗? 重要的是语感

形容词