英语语法分析问题A great number of people have realized how important

来源：学生作业帮编辑：搜搜做题作业网作业帮分类：英语作业时间：2024/05/25 12:33:57

英语语法分析问题
A great number of people have realized how important it is to reduce the amount of land pollution.请帮忙分析一下这个句子的成分,

A great number of people 主语,a great number of 是大量的,很多的,固定短语；
have realized 谓语, 用的是现在完成时；
how important it is to reduce the amount of land pollution. 整句话是how 引导的宾语从句,做realized 的宾语,其中：
it 是形式主语,is 是谓语动词,important是表语, to reduce the amount of land pollution是真正主语
再问：谢谢。。请问一下后面“how important it is to reduce the amount of land pollution”这个用法是什么语法知识，特别是那个"it“”（我只知道宾语补足语、主语从句用法中可以用it），感觉很奇怪。。
再答：这个就是it做形式主语的情况，我把它变成陈述句语序你就明白了，通常句子结构是： it is + adj. +( for sb.) + to do sth. 这个句子结构中，it 是形式主语，is 是谓语动词，adj.是表语， for sb是逻辑主语， to do sth.是真正的主语。上句就是这种情况，只是加了一个疑问词how，你对比一看就行。

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