英语形式宾语的问题 I think it necessary that we do everything careful

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英语形式宾语的问题
I think it necessary that we do everything carefully.
这句话可以改成用不定式I think it necessary for us to do everything carefully,
那么,但是为什么不能用I think it is necessary for.it这里不就是从句的主语吗,为什么没有is

赫赫,我以前也问过这个问题.当时我没太明白,希望现在我所说的你能明白.
I think it……中it necessary that we do everything carefully并不是一个完整的句子（没有be动词is）,之所以这样用是因为英语中比较忌讳“头重脚轻”的现象.因此有了形式主语和形式宾语这样的东西,先用it代替一下,后面再加上真正的主语或宾语.之所以形式主语的it之后有is,是为了构成一个完整的句子结构（因为我们都知道主语后面是要有谓语的）.而形式宾语并不是从句,没有完整的句子结构,用it仅仅是为了想个办法把很长的宾语变得简单一点.
I think it is necessary……中 it is necessary for us to do everything carefully整个是think的宾语,而且是一个宾语从句.作为从句,它是需要完整的句子结构的（有主、谓、宾等）,因此这里的it是整个宾语从句的（形式）主语.
这样说应该能能明白吧?有问题可以hi我!
祝你成功!

it形式宾语的问题we think it our duty to pay taxes to our government 英语小白问个简单的问题.I think it necessary to learn english.这 I think it adj.+ 从句 it作形式宾语,它所指代的宾语从句必须由that引导用所给的适当形式填空. 1.You must do it ______(careful) 2.I think the j I think it necessary that we take plenty of hot water every 关于宾补动词和宾语从句.如i think it necessary that he does it again.thin I think it necessary to do sth.还是 I think it is necessary to 英语的宾语从句16.We think that it’s important for us to learn Engli it做形式宾语的问题we think it our duty to pay taxes to our governmen i think it is necessary that. and that. We all think it necessary and important that a citizen I think that it is necessary in protect the environment.用英语怎