The student thinks it necessary to learn English grammar.这个句子的it 后面为什么没有be动词呢

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The student thinks it necessary to learn English grammar.这个句子的it 后面为什么没有be动词呢
The student thinks it necessary to learn English grammar.
这个句子的it 后面为什么没有be动词呢

The student thinks it necessary to learn English grammar.这个句子的it 后面为什么没有be动词呢
因为这个句子中的it是形式宾语,真正的宾语是后面的动词不定式to learn English grammar,而这个宾语太长了,为了避免头重脚轻现象,所以把它放在后面,前面用it作形式宾语.这句话的意思是：这个学生认为学习英语语法是重要的.当然这句话也可以变成宾语从句：The student thinks it is necessary for him to learn Englsih grammar.

这是一个固定句式，think it+adj +to do sth. it作形式宾语，真正的宾语是后面的不定式 to learn. 类似的情况还有很多，像find it+adj +to do sth。。。

think it necessary to do sth 固定搭配 认为做某事有必要 不需要be动词

这个句子是个错句子，不加be动词后面的to就不能出来

因为这是个病句~正确的应该是
The student thinks （that）it is necessary to learn English grammar.

英语句子中只能有一个动词，在一个没有动词的句子中就要加be。此句已经有动词了，所以不需要再加Be动词了。

think +宾语+形容词、名词：
I think him right / a thief.

it作形式宾语，真正的宾语是后面的动词不定式to learn English grammar

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