it's important to
后跟做什么=do sth.,表示去做什么很重要
it's important for
后跟什么=sth.,表示对什么很重要
例:
it's important to ask this question
问这个问题很重要
it's important for you
这对你很重要
最后,以上词组可以合起来用
it's important for sb.to do sth.
例:
it's important for you to ask this question
问这个问题对你很重要