such as to的这个词组里,such是做代词,而so as to 里面,so不能做代词成分.
比如This book is such as to interest me a lot.这本书是这样的,以至于引起了我的兴趣.注意这句话读的时候要这样读,This book is such先停顿一下,再连下去读as to interest me a lot.
so as to举例,I get up early so as to arrive at school on time.