so as (not)to跟 in order (not) to 的用法

so as to 为的是,以便
Please check the list carefully so as to avoid mistakes.
请仔细核对单子以避免发生错误。
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。
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。
in order to 为了
He lit a cigarette in order to calm his mind.
他点燃一支香烟，镇定一下情绪。
She is sieving the rice in order to sieve out the stones.
她正在把米过筛，好把石头筛出。
She stinted herself of food in order to let the children have enough.
她自己省着吃，好让孩子们吃饱。

in order to
in order not to
可以用在句首

在句中， 两个都可以用

都是为了不要怎样
只有 in order not to 可以用在句首。

so as (not) to 可用于句子中间.in order (not) to不能用于句中,用于句子开头.