so that.so that是從屬連接詞,卻具有對等連接詞,接續(xù)前文的意味(so …,所以)；so … that …中that 是從屬連接詞,so 卻是副詞；
such that也是從屬連接詞,意為"這麼一來就...(in such a way that)"；such … that…中that是從屬連接詞,such 卻是形容詞,
其中so that既可省略so亦可省略 that,其語意和such that其實不盡相同；as … that …中that 是從屬連接詞,as 也是從屬連接詞,取代so的用法,如同取代 though / althouth一般.
She works very hard so that she is sure to be successful.她很努力所以她一定會成功
She works very hard such that she is sure to be successful.她很努力這麼一來她勢必會成功