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my father enjoys the books_by akasha为什么答案是written?要省略was?为什么

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my father enjoys the books_by akasha为什么答案是written?要省略was?为什么这句又不省keys_used for opening the door?
my father enjoys the books written by Akasha.
written是过去分词做后置定语,修饰books.
句子也可以写为
my father enjoys the books (which/that were) written by Akasha.括号里的可以省略,因为(which/that were) written by Akasha 是定语从句,起修饰作用,而不是一个单独的主句.
而 keys are used for opening the door.钥匙是用来开门的.这是一个独立的句子,如果省略了be动词(are)的话,句子就不对了.
被动语态 be used for
举个例子
This key is used for opening my room.is不能省略
I lost the key (which/ that is) used for opening my room.括号的能省略.
缘由如上.