整理RON对“so that”,"so...that...","such...that...","so as

AMBER513

[hide=d1e+24]1  so that   
"So that" is an subordinating conjunction, it also illustrates the meaning of "so that..." -- namely, that construction is placed in front of   a clause that describes the intention or goal of some action.

2  so ADJ/ADV that... & such ADJ+NOUN that...
2.1  相似点They are used to emphasize extreme quality of ADJ/ADV  and followed by some consequences of thatextreme quality.
          I study so hard that I can get a good grade.
这个句子只有在考试尤其困难，而且取得成绩很好时才成立。
For instance, let's say there's a class called "math X" at some university, and that class is so difficult that only one in every thousand students even gets a passing grade. In that case, "I study sooooo hard that I can actually get a good grade in math X" makes sense. On the other hand, if this is just a sentence about normal intentions, then it's wrong.
2.2 区别（这个区别非常subtle以至于几乎不会考）
当某物的性质可以直接用ADJ/ADV表示时，such ADJ+NOUN that...的表达会显得unnecessary, it's more compact and stylistically better to write "so ADJ/ADV that...".
当所表达的extreme的性质蕴含于名词本身而非用ADJ/ADV直接表达时，才会选用“such ADJ+NOUN that...”的表达方式。
例如：Tom is such a hermit that he hasn't left his house in two years.

3  so as to(such as to和它的区别同上）  
区别于to和in order to(此二者没有明显的区别，只是in order to更常用于长句子中避免歧义），so as to后面跟的一般是indirect intentions.
例如：Joe bought a gym membership so as to become more attractive to women.
This is what I mean by indirect intention. Obviously, the act of buying a gym membership itself is not going to make Joe instantly more attractive to women (women do not swoon over a man's gym membership card). Instead, there are plenty of implied intermediate steps between "by a gym membership" and "be more attractive"; the use of "so as to" implies that there are such intermediate steps in the process.

这一点RON 也说不太会考

4  so...as to
In general, you don't use "so ADJ as to VERB" unless the VERB describes some sort of state/condition. i.e., if the verb is an action verb, this construction generally isn't used.
For instance,
I am so ugly as to be viscerally repulsive to women. --> this works, because the verb "to be" describes a state/condition.
I am so ugly as to repel women on sight. --> you generally wouldn't see this in good writing, as "repel" is an action verb; the sentence would probably be written as I am so ugly that I repel women on sight.

以上是我根据RON在一个帖子里的回答进行的整理，方便复习，有错误的地方还请大佬们指出
回答链接https://www.manhattanprep.com/gmat/forums/so-that-such-that-so-as-to-t13833.html?uid=701179


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