i think __important for us to learn english well

i think __important for us to learn english well

题目
i think __important for us to learn english well
填 it .为什么呢?
that's为什么不可以?
答案

i think 【it】important for us to learn english well

it 是形式宾语,真正的宾语是后面的不定式 to learn english well

实际上句子是:

i think 【 to learn english well】important for us.

如果要改成that从句,那应该是 :

i think 【that  it is 】important for us to learn english well

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