请帮我分析下面的句子结构
新概念三册32课的课文: A radio message from the mainland had been received by the ship's captain instructing him to give up the search..这里的instructing 是作状语还是主补?
主补
我认为是主补，显然instructing...是a radio message的内容.
我认为instructing him to give up the search 是分隔性定语，修饰主语a radio message,用来说明主语的内容，而不是主语补足语或状语
修饰动词的才是状语，这里instructing him to give up the search是补充说明主语A radio message 的，因此是主补。
是主补
同意我楼上的
补语。是radio message的内容嘛。
A radio message from the mainland had been received by the ship's captain instructing him to give up the search..这里的instructing 是作状语还是主补? 理解成定语或同位语才对：变化原句成：A radio message （which/that instructed）instructing him to give up the searchfrom the mainland had been received by the ship's captain ..
是主补A radio message （which/that instructed）instructing him to give up the search from the mainland had been received by the ship's captain.
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