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分析下这句话的语法A radio message from the mainland had been received

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分析下这句话的语法
A radio message from the mainland had been received by the ship's captain instructing him to give up the search.
我看不懂句子结构啊!这是新概念英语课文的句子
A radio message ( 主语)from the mainland (介词短语作定语) had been received (过去完成时被动语态 作 谓语) by the ship's captain ( 介词短语 状语,强调动作由谁来做) instructing him to give up the search ( 分词短语作状语).