so,that,so that的用法区别?

C。
简单的说：so that：“以便……”,直接接句子,表示结果,可以说so that=in order to do sth ,so。。。that表示“如此……以致于”,此句型中so后接形容词或者副词,that后接句子。
复杂的说：（以下资料引自frankietangzq的解答）so。。。that。。。”句型的意思是“如此/这么……以致于……”,常引导结果状语从句。
一、 so。。。that。。。句型中的so是副词,常常用来修饰形容词或副词,常用句型为：主语+谓语+so+adj。/ adv。+ that从句。例如：
1。he is so young that she can't look after herself。
2。The boy ran so fast that I couldn't catch him。
3。He was so angry that he couldn't say a word。
二、 在“such。。。that。。。”句型中,such修饰名词,意思也是“如此……以致于……”但当名词前有many、much、(a) few、(a) little等词修饰时,句子中要用“so。。。that。。。”而不能用“such。。。that。。。”。例如：
1。He has so much money that he can buy what he wanted。
2。I've had so many falls that I have pains here and there。
3。There is little water in the glass that I can't drink any more。
三、 so与that也可连起来写,即变成：。。。so that 。。。(以便 / 为了……),引导目的状语从句。例如：
1。I got up early so that I could catch the early bus。
2。Please open the window so that we can breathe fresh air。
3。You must go now so that you won't be late。
四、以“so。。。that”引导的结果状语从句可以转换成不定式的简单句,即可转换为“。。。enough to。。。”或“。。。too。。。to”句型,但这种转换必须符合下列条件：
1。当主句和从句的主语一致,且that从句是肯定句时,可用“enough to do sth。”来转换。例如：
The man is so strong that he can lift the heavy box。→
The man is strong enough to lift the heavy box。
He was so clever that he can understand what I siad。→
He was clever enough to understand what I siad。
2。当主句和从句的主语不一致,且that从句是肯定句时,可以用“enough for sb。to do sth。”来替换,但须注意不定式的宾语要省略。例如：
The question is so easy that I can work it out。→
The question is easy enough for me to work out。
The box is so light that he can carry it。→
The box is light enough for him to carry。
3。当主句和从句的主语一致,且that从句是否定句时,可以用“too。。。to”来替换。例如：
The girl is so young that she can't dress herself。→
The girl is too young to dress herself。
I was so tired that I couldn't go on with the work。→
I was too tired to go on with the work。
4。当主句和从句的主语不一致,且that从句是否定时,如果要用“too。。。to。。。”替换“so。。。that。。。”,则用介词for引出动词不定式的逻辑主语,可以用“too。。。for sb。to do sth。”来替换,注意不定式的宾语要省略。
The bag is so heavy that she can't move it。→
The bag is too heavy for her to move。
It is so hot that we can't sleep。→
It is too hot for us to sleep。