so that, so as to, in order to 怎么区别？分别有什么用法？

in order to+动词原形和so as to+动词原形 都可以放在句中。 She got up early in order to / so as to catch the first bus. 她早早起了床以便赶上头班车 。 The doctors gave her a general checkup so as to/ in order to find out the cause of her illness. 医生给她做了全身检查， 以便找出她的病因。 in order to 可以放在句首，而so as to 则不可。 In order to win the watch , they practiced hard. 为了赢得比赛，他们刻苦训练。 In order to get good results, we ought to do our best to study the lessons. 为了获得好成绩， 我们应尽最大努力学好课程。 2.so that 和 in order that 意思相同 “目的是 以便”引导目的状语从句

You must speak louder so that /in order that you can be heard by all. 你必须大点声，别人就能听见了。

3. so…that 和 such…that 如此..以至于..
结果状语从句常由so…that 或 such…that引导。so…that与such…that之间可以转换。例如：

The boy is so young that he can't go to school. 这男孩年龄太小，不能上学。

He is such a young boy that he can't go to school

so that 后面跟目的状语从句。in order to和  so as to后面跟动词原形，in order to可以放在句首但 so as to不行。

You must speak louder so that /in order that you can be heard by all.

The doctors gave her a general checkup so as to/ in order to find out the cause of her illness.

The boy is so young that he can't go to school.

属于目的状语从句:从句部分是用以补充说明主句中谓语动词发生的目的的状语从句。

举例：

Say it louder(so)that everyone can hear you.

大声说，以便大家都能听到你的声音。

So that在目的状语从句中可表示"为了"的意思;在结果状语从句中表示结果。

目的状语从句:从句部分是用以补充说明主句中谓语动词发生的目的的状语从句。

表示目的状语的从句可以由that, so that, in order that, lest, for fear that, in case等词引导;

目的状语从句的谓语常含有may, might, can, could, should, will, would等情态动词。

一些用法：

1) so … that…/ such ….that

该句式中重要考查的是so和such的区别。应注意以下可能出现的结构:

so nice a boy that…

such a nice boy that…

so beautiful/diligent/carefully … that…

such (fine weather/great improvement) that…

2) so that

She worked hard so that everything would be ready by 5 o'clock.

她努力工作，以便在五点前是一切都就绪。

She looked down so that she should not see his eyes.

她垂下目光，使她看不到他的眼睛。

Everyone lend a hand, so that the sowing was done in time.

该句式中主要考查so that 与其它短语的区别，如:

由于so that也可以引导目的状语从句，同学们应特别注意从句中时态的运用。

3) so much so that

该结构用于形容词或副词之后，表示"到如此程度以致于"。如:

He was very weak, so much so that he could not walk.

I long to visit Beijing, so much so that I dream about it every night.

4) 注意结果状语从句与too….to..enough to…, so… as to结构的不同。

5)in order(that)"以便" to the end that "为……起见，以便"

so that 可以接目的状语从句,也就是说能接句子.so as to 不可以接目的状语从句,也就是说不能接句子.因为是不定式to do,后面只能接动词原型.in order to 也是不定式to do,后面只能接动词原型,但可以放句首作目的状语,但so as to不可以放句首.

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保存答案：
in order to+动词原形和so as to+动词原形 都可以放在句中。 She got up early in order to / so as to catch the first bus. 她早早起了床以便赶上头班车 。 The doctors gave her a general checkup so as to/ in order to find out the cause of her illness. 医生给她做了全身检查， 以便找出她的病因。 in order to 可以放在句首，而so as to 则不可。 In order to win the watch , they practiced hard. 为了赢得比赛，他们刻苦训练。 In order to get good results, we ought to do our best to study the lessons. 为了获得好成绩， 我们应尽最大努力学好课程。 2.so that 和 in order that 意思相同 “目的是 以便”引导目的状语从句

You must speak louder so that /in order that you can be heard by all. 你必须大点声，别人就能听见了。

3. so…that 和 such…that 如此..以至于..
结果状语从句常由so…that 或 such…that引导。so…that与such…that之间可以转换。例如：

The boy is so young that he can't go to school. 这男孩年龄太小，不能上学。

He is such a young boy that he can't go to school