the novel written by Mo Yan是过去分词作后置定语,修饰名词the novel ,意“莫言写的小说”。表示完成或被动的动作。the novel written by Mo Yan莫言写的小说(意同the novel which was written by Mo Yan)。如果用have you read the novel is written by Mo Yan同一个句子出现了read和is两个动词且不是从句和并列句关系,说不通。例如: This book was written by Tom. (被动语态的简单句) The books written by Tom are very good. ( 过去分词做后置定语句子。)