so that 和 so ...that怎么分

so that：以便,为了。。。
She decided to buy a digital camera online so that it could be sent to her.
她决定在网上订购一个数码相机,那样便可以邮寄给她。

so...that:以致于。。。
He was so tired that he fell asleep as soon as he lay in the bed.
他太累了以致于他一躺在床上就睡着了。