so that造句

一、He is too young to go to school.他年纪太小了，不能去上学。二、He is so young that he can't go to school.他年纪太小了以至于不能去上学。三、He is not old enough to go to school.他年纪不够，不能去上学。这里共用了三种固定短语的表达方式：1、too……to……太怎么样...