划分英语句子成分,it is necessary for us to learn English well.

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划分英语句子成分,it is necessary for us to learn English well.

划分英语句子成分,it is necessary for us to learn English well.
划分英语句子成分,
it is necessary for us to learn English well.

划分英语句子成分,it is necessary for us to learn English well.
现在这类型的句子可看成是一个句型It is +adj.+for sb.+to do sth
其实it是形式主语,后面的to do sth才是真正的主语,for sb 其实是to do的逻辑主语.
这样放置是为了避免头重脚轻,因为在英语中,只有一个句子呈现“孔雀”式的句子,才算正确、规范
“孔雀”,就是头小,身子大.那么英语句子也喜欢这样.这就是为什么英语句子中总喜欢有形式主语,真正主语的原因
这句意义相当于“To learn English well is necessary for us.”

it是形式主语,动词不定式to learn English well是真正的主语,is是谓语啰。

it is necessary to learn English well.
it is 做形式主语 真正的主语是 to learn English well. 这样做的目的是避免句子头重脚轻 for us 是逻辑主语

赞三楼,很正确完整详细