I think it neccessary for students to take an interest in al

来源：学生作业帮编辑：大师作文网作业帮分类：英语作业时间：2024/11/18 01:09:50

I think it neccessary for students to take an interest in all subjects .
这里的it是作形主还是形宾,it作形主还是形宾是看前面的句子,还是看从句,

这里是形式宾语,因为it后面没有谓语动词,所以it只是做think的宾语
再如
I think it is neccessary for students to take an interest in all subjects .
这里it 后面加了一个is ,此时it做的就是形式主语,相当于think后面省略了that,这是that引导宾语从句,而it做宾语从句的形式主语.
判断it做形式主语还是形式宾语,主要看 it后面是否是一个完整的句子,也就是后面是否有谓语动词,如果有就是形式主语,如果没有就是形式宾语
再问：也就是说I think it neccessary for students to take an interest in all subjects .不是宾从，而I think it is neccessary for students to take an interest in all subjects .这个句子才是宾语从句对吗？
再答：对

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