----whose book is it? ----it’s not_______book.it’

----whose book is it? ----it’s not_______book.it’

◆whose book is it? 可以有两种回答：
it’s not【my】book.it’s【his 或hers】
或者
it’s not【his/her】book.it’s【mine】

mine
hers/his

A.worth 用法：sth. be worth doing that is,This book is worth reading carefully. B.well worth 同A（意思为“非常值得”well是副词，修饰worth) C.worthy 同样表“值得的”，用法：sth. be worthy to be done OR sth. be worthy of being done that is,This book is worthy of being read carefully. OR This book is worthy to be read carefully. D.worthwhile 一个纯粹的形容词，用在这句话中非常合适，句型： It is +adj.+to do sth. P.S.老师教我们的时候，提醒我们要区分worth与worthy: worth忌被（动），worthy 忌主（动）； worth后只接一（个动词），worthy后可接三（个动词） 一点愚见，见笑了：）