so,that,so that的用法区别？

Question

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？

Answer 1

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.

Answer 2

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

Answer 3

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，