Question

It's important for us _______(study) English.

填什么？
为什莫？

Answer 1

填写：to study

It's+adj+to do sth.
做某事很重要。

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Answer 2

to study

解释：
to study English 在此句是不定式短语作真正主语， 句首的It 为形式主语。
It is important to do sth 意为“干。。。。。。事情很重要”， 常用以表示一个建议。

翻译：
It is important to study English.
学英语很重要；学习英语是很重要的

例句:
1.
I found it is the most important thing to study English well.
我发现最重要的事情是学好英语

2.
It is important to study English as well as science and technology for our socialistmodernization drive.
学科技、学英语，对社会主义现代化建设很重要。

3.
it is important to study English.
学好英语对我们来说是太重要了。

Answer 3

It's important for us __to study_____(study) English
因为是固定的句式：
it is adj for sb to do sth
it 是形式主语，to do 不定式做真正的主语

Answer 4

to study

。