in order to用法

in order to可以用在句首或句末，但so as to只能用在句末。

如：

He got up very early in order to/so as to catch the first bus.

In order to catch the first bus,he got up very early.（此时不能用so as to）so as to 和in order to的汉语意思应该是一样的“为的是，为了”。它们的英语功能也是一样的，都可以用来引导目的状语。它们的不同之处就在于so as to 不能用于句子的开头，在句子开头只能用in order to.

另外，

1.in order to 一般用in order that加从句来替换；而so as to 一般用so that加从句来替换。in order that 可以在句首，so that和so as to 一样不能在句首。

2.当这两个短语后的不定式动词的逻辑主语和句子的主语一致时，“in order to , so as to +不定式”可以简化为“不定式”

In order to get to school on time,he got up earlier.这个句子可以表达为下列几种方式：In order that he could get to school on time,....

He got up earlier in order to get to school on time.

He got up earlier in order that he could get to school on time.

He got up earlier so as to get to school on time.

He got up earlier so that he could get to school on time.

To get to school on time, he got up earlier. （这种不定式有时可以表示目的以外的状语）

1.so that表目的。在非正式语体中，so可以代替so that,引出目的状语从句。例如：He is going to the lecture early so (that) he will get a good seat.

2.so that表结果。so是so that 的省略形式，引导结果状语从句，主要用在口语中。

3.in order that与虚拟式

They removed the prisoner in order that he not disturb the procceedings any f urther.句子中he not disturb符合语法吗？是否应该改成he does not disturb?

在正式语体中，in order that引导的状语从句有时也采用现在虚拟式，上句中的he not disturb也可以用he should not disturb来替换。

4.in order that与情态动词

在in order that从句中可以使用can,could,may,might,should,would等情态动词。

5.in order to

in order to+动词不定式用来表目的，它所引导的是目的状语。

6.so that与in order that的关系

in order that用于相当正式的语体中，表示经过精心策划的目的，有时可与so t hat互换。