The book is well worth to read. （误）

Such CPU has not been invited yet, but it is worth to do so. （误。不知所云）

Is it worth it to do so? （正。不定式是真正主语。第一个 it 是形式主语，第二个 it 是 worth 的介宾。）

网友把这些句子记住：

1  This book is worthy to be read. （正）

2  This book is worthy of being read. （正）

3  This book is worthy being read. （正） 

4  These rules are worth remembering.（正）

5  It is worth remembering these rules.（正）

6  It is worthwhile remembering these rules.（正）

7  It is worthwhile to remember these rules.（正）

【说明】

1,2,3 worthy 都是形容词。

4 worth 是介词；5 worth 是形容词。

6,7 worthwhile 都是形容词。

The book is well worth to read这样写是错的吗？ 但网上有很多用to的句子 Such CPU has not been invited yet, but it is worth to do so. Is it worth it to do so?

      【答】worth 后接 v-ing 形式（主动形式表示被动意义，但不可接动词不定式）。例如：London is a city worth visiting. 伦敦这个城市值得一游。/ You are not worth helping. 你不值得帮助。（摘自《薄冰英语惯用法词典》p.1351）

      The book is well worth to read. (错误)

      Such CPU has not been invited yet, but it is worth to do so. （错误）