important to do sth.be improtant to doing sth.important for sb.怎样区分?分别运用在什么场合?

1.imprtant to do sth.做……事是重要的一般的句型是 It's important to do sthIt's important to study.学习是重要的.2.be important to doing sth.是没有这个句型的.to只有作为介词的时候才能加doing sth.比如：lo...