I think that it is important to master a foreign language.(改为同义句)I think _____ _____ ______ _______ a foreign language.important to master,可是还是不明白为什么,这涉及到什么形式主语、形式宾语之类的,我不太明白

I think that it is important to master a foreign language.(改为同义句)I think _____ _____ ______ _______ a foreign language.important to master,可是还是不明白为什么,这涉及到什么形式主语、形式宾语之类的,我不太明白
I think that it is important to master a foreign language.(改为同义句)
I think _____ _____ ______ _______ a foreign language.
important to master,可是还是不明白为什么,这涉及到什么形式主语、形式宾语之类的,我不太明白,

I think that it is important to master a foreign language.(改为同义句)I think _____ _____ ______ _______ a foreign language.important to master,可是还是不明白为什么,这涉及到什么形式主语、形式宾语之类的,我不太明白
原句I think that it is important to master a foreign language.的it是形式主语.
I think it important to master a foreign language.it是形式宾语
1.it做形式主语
It is +adj.+(for sb.) +to do sth.
It is time to do/for/that.
2.it做形式宾语

it important to master
it在这里是形式宾语 因为它在that后面 所以不是形式主语

it是形式主语

形式主语是指用it来代替一个比较长的主语（可以是主语从句、不定式等），避免头重脚轻。
如: To learn a second language is important. = it is important to learn a second language.
形式宾语是指用it来代替一个比较长的宾语（可以是宾语从句、不定式等），避免头重脚轻。
如：I find si...

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形式主语是指用it来代替一个比较长的主语（可以是主语从句、不定式等），避免头重脚轻。
如: To learn a second language is important. = it is important to learn a second language.
形式宾语是指用it来代替一个比较长的宾语（可以是宾语从句、不定式等），避免头重脚轻。
如：I find singing interesting.
i fing to play a joke on others interesting. 用一个it来代替“to play a joke on others”,然后把这个放在后面。变成：i fing it interesting to play a joke on others .
同样的：i think that it important to master a foreign language. it是形式宾语，真正的宾语是“to master a foreign language”
=i think that to master a foreing language important.

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作为形式主语或宾语的it并无实际语义，只是为满足语法上的需要，避免句子头重脚轻。原句I think that it is important to master a foreign language中，i是主语，think是谓语动词，think 后面接了一个that从句作宾语，句子的结构为主+谓+宾。that从句中，it作形式主语，真正的主语是后面的不定式短语to master a foreign...

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作为形式主语或宾语的it并无实际语义，只是为满足语法上的需要，避免句子头重脚轻。原句I think that it is important to master a foreign language中，i是主语，think是谓语动词，think 后面接了一个that从句作宾语，句子的结构为主+谓+宾。that从句中，it作形式主语，真正的主语是后面的不定式短语to master a foreign language，还原主语就是to master a foreign language is important，is 是系动词，important是表语。同义句I think it important to master a foreign language中i还是主语，think还是谓语动词，只不过这时think有两个宾语，即双宾语（宾语+宾语补足语）。其中it作形式宾语，真正的宾语是后面的不定式短语to master a foreign language，important这时作为宾语补足语，补充说明宾语（to master a foreign language）的情况，这时还原就是I think to master a foreign language important。这时候句子的结构为主+谓+宾+宾补。

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it 做形式宾语且前置，真正的宾语应该是介词词组yo master a foreign language