句子结构 划分 it 所指什么什么含义 以及句子结构 it所指的什么I feel that it would be beneficial to express my views concerning the quality of the library serviceto express my views concerning the quality of the library service

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句子结构 划分 it 所指什么什么含义 以及句子结构 it所指的什么I feel that it would be beneficial to express my views concerning the quality of the library service
to express my views concerning the quality of the library service would be beneficial这么就对了吗 (正常语气)

I(主语) feel (谓语)that(宾语从句的引导词) it(宾语从句的形式宾语) would be beneficial(宾语从句的谓语) to express my views concerning the quality of the library service (宾语从句的主语)

形式主语(从句中的主语),to后面接的句子才是真正的主语

主句:I feel that...
that引导宾语从句
it是这个宾语从句中的形式主语,真正主语是to express....