【问】 A：“I had to pay ten dollars for this book.”
 ×B ：“It’s probably worthy it.”
 请问这个句子的错误何在?
 【答】 worthy与worth有一个很主要的差别：be worth之后可以直接跟由名词或代词充当的宾语(worth ten dollars)，而be worthy则不能直接跟由名词或代词充当的宾语，而必须通过of：
 1. His behaviour is worthy of great praise. (Palmer)
 他的行为值得高度赞扬。
 2. The teacher is worthy of respect.
 这位教师很值得尊敬。
 3. That wild theory is not worthy of systematic confutation.
 那种毫无根据的理论不值得系统的批驳。
 worth常常用在金钱方面(值……多少钱)，而worthy of则不能：
 1. How much is the picture worth? (Palmer)
 这幅画值多少钱?
 2. It was worth at least fifty francs.(Bennet)
 它至少值50法郎。
 worth与worthy的其他区别是：
 A. worthy可以用作定语，而worth则无这种用法：
 1. The school has graduated many worthy young people. (FWF)
 这所学校培养出了许多有为的青年人。
 2. He has had a worthy object in view.
 他心目中有个崇高的目标。
 B. worthy可以后接动词不定式，而worth却不能后接动词不定式，参见worthy to do。
 从上面的例句不难看出，你所提问的句子中的worthy应当改为worth。
 请做下面的英语试题：
 1. “What can I do for you，sir?” “I want____.”
 A. a dime’s worth of candy B. candy a dime’s worth
 C. a dime worth of candy D. a dime-worth candy(TOEFL，73.10)
 2. The recent issue of this periodical is worth____.
 A. to read B. reading
 C.for you to read D.for you reading(攻读硕士学位研究生入学考试英语试题，78)