it's too adj for sb to do sth 同义句是sb is adj enough to do （太.

too...to（太.而不能）
so...that（如此.以至于）
adj enough to...(太.而不能） 我们老师是这样教的,三个用法一样
再问： 是不是 应该是sb be not adj enough to do sth呢？ 还是 是sb be adj enough to do sth
再答： sb be not enough to do sth 我给你例句你看一下 she is too young to go to school she is not old enough to go to school she is so young young that she can not go to school 意思差不多都是 她太小而不能上学