定语修饰名词和such as，for example没有直接关系啊想你上面讲的都是定语从句的一般用法 只是刚好和such as等一起使用了such as book, notebook which is old and pen. which引导从句修饰notebookfor example,pen,book,and ruler which is clean. which引导从句修饰ruler
