the book is worth reading,reading是什么成分做什么用法

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the book is worth reading,reading是什么成分做什么用法
the book is worth reading,reading是什么成分做什么用法

the book is worth reading,reading是什么成分做什么用法
worth是介系词,后面的doing是动名词,不是现在分词,是作介系词worth的宾语,而且worth后作其宾语的动名词,是用主动形式表示被动意义,这和形容词worthy和worthwhile是不一样的.如:
This book is worth reading.
This book is worthy of being read.
It is worthwhile to read the book.
Reading the book is worthwhile.