so as to有“in order to”的意思,即“为了.” eg.:Mail your package early so as to ensure its timely arrival.为了保证能按时到达请早点邮寄你的包. such as to ,such在这里是代词,有“这样,这种,如此（地步）”的意思,as to:以至于,按着.连起来有点这个意味：这样以至于.常用于表示强调,夸张的语气中. eg.:His manner was such as to offend everyone who he met.他的行为已经到了见人就伤的地步.
