To study English is important ---you.(填介词)

在通常,sth is important to sb 对某人很重要 ,但是,这道题实际是It is important ___you to study English 。
所以因用for
通常有了一个to时,人前就用for,同样译为对某人（很重要）
doing sth is adj to sb
To do sth is adj for s