Question

it is useful to me that people thought i was so angry or sad that i ended my life then

it is useful to me that people thought i was so angry or sad that i ended my life then ，这句话的主谓宾状分别是什么？that people thought i was so angry or sad that i ended my life then属于什么语，这句话中的主谓宾状结构又是什么？

Answer 1

【that people thought I was so angry or sad that I ended my life then】这个是主语从句，原句中用it形式主语代替了。
【I was so angry or sad that I ended my life then】这个是thought的宾语从句。
这里有个so that句型，可以把【that I ended my life then】理解为结果状语从句。
整句话的结构就是，【that people thought i was so angry or sad that i ended my life then】是主语，is 是谓语,useful是表语,to me是状语。

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追问

to me为什么是状语，为什么不是宾语？

追答

to 是介词，me 是宾格代词，是to的宾语，
介宾短语作状语。

追问

那么把to改为for也是状语吗？

追答

是的，也是状语。
用for 和to均可以表示“对我而言”，只不过to主观色彩更浓。

追问

非常感谢！