It's important for us learing English well.

be important to do sth.be important for sb.

to learn English well

It's important (for us) to learn English well.

It's important for us to learn English well
这是一个常用句型
It's + 形容词（说明事物特征的）+ for sb. to do sth.
例如
早起对我们身体有好处。
It's good for us to get up early in the morning.