It is so useful and helpful that I really do not know how I lived without this wonderful invention
问题描述：
It is so useful and helpful that I really do not know how I lived without this wonderful invention
that……是什么用法?and不行吗?
答
这个是英语中很普遍的一种用法.
句型是：
so...that
意思是：很怎么样以至于.
在这样的句子中,一般是so...that的固定搭配,是不能改成用and的.会破坏句子的结构.