Question

这句话的语法（主谓宾）？？？

A radio message from the mainland had been received by the ship's captain instructing him to give up the search.
2 Those who seek it undertake an arduous journey and can never be sure that they will find it.

Answer 1

你好，同学，很高兴回答你的问题

正确答案：

1. A radio message from the mainland had been received by the ship's captain instructing him to give up the search.

主语： A radio message

谓语： had been received

宾语：the ship's captain instructing him

2 Those who seek it undertake an arduous journey and can never be sure that they will find it.

主语：Those

谓语：undertake, can never be sure

宾语：an arduous journey, that they will find it.

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希望能帮到你，祝更上一层楼O(∩_∩)O
不明白请继续追问，可以详谈嘛(*^__^*)
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Answer 2

（A radio message） from the mainland （had been received ）by （the ship's captain） 主语 修饰主语 谓语 宾语
instructing him to give up the search.
修饰主语的，补语