这个是有公式的，是it's+adj.(形容词)/n.(名词)+for sb.(someboby 某某人)to do sth.(something 某某事)所以套进去，就是It's important(重要的，adj.)for us to keep quiet in the library.注意to哦!不懂再问我
在图书馆保持安静，对我们来说是很重要的。
It's very important for us to keep quiet in the library.
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Keep quiet in the library is a very important thing for us.
It's very important for us to keep quiet in the library.
it's important that keep quiet in the library.
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