such as to 与so as to 区别

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.

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。

We are not such fools as to believe him.
He was so angry as to be unable to speak.