so,that,so that的用法区别?题：The teacher spoke loudly ______ the students could hear him clearly .A.so B.that C.so that D.until PS:that ,so,so that 都可以引导状语从句,so肯定不选,但是that 和 so that 怎么来界定呢?

so,that,so that的用法区别?题：The teacher spoke loudly ______ the students could hear him clearly .A.so B.that C.so that D.until PS:that ,so,so that 都可以引导状语从句,so肯定不选,但是that 和 so that 怎么来界定呢?
so,that,so that的用法区别?
题：The teacher spoke loudly ______ the students could hear him clearly .
A.so B.that C.so that D.until
PS:that ,so,so that 都可以引导状语从句,so肯定不选,但是that 和 so that 怎么来界定呢?

so,that,so that的用法区别?题：The teacher spoke loudly ______ the students could hear him clearly .A.so B.that C.so that D.until PS:that ,so,so that 都可以引导状语从句,so肯定不选,但是that 和 so that 怎么来界定呢?
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.

我是个小学生。。随便说几句。。。
so that“太……以至于不……”后面的从句表否定意义，

因为so that= 1.以便 2.结果, 以致

that =(用于某些动词、形容词和名词后，引出各种从句) 2.（表示结果）如此…以至 3.（表示希望或愿望）多么
所以是 =so that