倒装句 so adj 和 such a adj n 提至与句首区别，分析列子。

(such a heavy box is ) that ,i can't carry it

与 (so heavy is the box ),区别在哪？

such a heavy box is that,i can't carry it的意思是那箱子很沉，我搬不动。是个陈述句，描述了一个事实，即箱子重我搬不动。so heavy is the box that i can't carry it的意思是这是一个沉得让我搬不动的箱子，that后边的是个从句，修饰的是前面的内容，重点强调的是box。