so as to:
为的是,以便
例句与用法:
1. He ran quickly so as to catch the last bus.
他跑得很快以便赶上那末班车。
2. The two lovers dropped back so as to be alone.
那对情人落在后面，为的是两人好单独在一起。
3. I left a message so as to be sure of contacting her.
我留下了张条子以便与她取得联系。
4. Gummed so as to adhere.
涂胶的涂上胶以便粘附的
5. Listen carefully so as to follow the teacher.
要仔细听才能听懂老师讲的课。
6. The book will be indexed in the next edition so as to make it more useful.
为了使它更实用，这本书在下一版本中将编有索引。
7. We use our eyelids to blink so as to clean our eyes.
我们利用眼睑眨眼来清洁眼睛。
8. Please check the list carefully so as to avoid mistakes.
请仔细核对单子以避免发生错误。
such as to:
达到这样的程度以致
例句与用法:
1. His speech is such as to incur enmity.
他的演说会引起别人的敌意。
2. Her madness is not such as to fill her mother with despair.
她还没有疯到令其母亲绝望的程度。
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.