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题库 / Prep2008E1-SC-174
Often major economic shifts are so gradual as to be indistinguishable at first from ordinary fluctuations in the financial markets.
so gradual as to be indistinguishable
so gradual so that they can be indistinguishable
so gradual that they are unable to be distinguished
gradual enough not to be distinguishable
gradual enough so that one cannot distinguish them
题目分析：
本题难度主要存在于选项(A)和选项(C)的判断。这里总结一下关于so as to和so that在字面上的区别。so…that可以用作多个主语时，so前面的主语和that后面的主语可以不一样，例如：
I set up the computer so that they could work from home.（我把电脑设置好，这样他们就可以在家办公了。）
so as to要求so前的主语和as to身后动作的主语相同。例如：
I set up the computer so as to do my work. （我把电脑设置好以便完成我的工作）
此时，do my work的主语必须是I。
选项分析：
A选项：Correct. 本选项在语法和逻辑上均是正确的。
B选项：想表达因果关系时，要么说so…that…，要么只说so，而不能用so…so that。
C选项：本选项在语法上没有问题。但在逻辑上，应将so gradual that改为so gradual as to be。这点考查了不定式和从句的区别。用之于本题，由于变化部分是状语，所以需判断主句的发生对状语事件的发生与否是否有直接影响。显然地，主句“主要经济变化是如此的逐渐”这个事件会直接影响“主要经济变化不能在最开始被检测出来”这个事件的发生与否。显然地，经济变化只要具有逐渐这个特点，则其就会具有难以被检测这个特点。因此，只能用不定式短语。
D选项：enough表示“足以”，不能展现出主句和从句的因果关系。
E选项：enough和so…that…是重复的，不能同时出现。
虽然so as to与so...as to在形式上差不多,而且后面都接动词原形,但它们表示的意思和在句中的作用却不同:前者表示“为的是; 是为了; 以便”的意思,与其后的动词原形一起作目的状语,用来强调目的; 后者表示“那么地……,以至……”的意思,so后面接形容词或副词,在句中as to和其后的动词原形一起作结果状语.
经济变化只要具有逐渐这个特点，则其就会具有难以被检测这个特点
in general, "so [adj/adverb] that [complete sentence]" is used when "[complete sentence]" has a DIFFERENT SUBJECT than the original sentence.
e.g., When I came back from vacation, I was so tan that my friends didn't even recognize me.
(subject changes from "i" to "my friends")
if the subject is still the same, then "so [adj] as to [verb]" is a more efficient way to write the construction.
The question you should really ask yourself is, "Are we talking about something that X can do?"
If the answer to this question is yes -- regardless of whether X is a person or an animal -- then "(un)able" / "(in)ability" should be fine.
If you're talking about something that someone can do to or with X, then you shouldn't use those words.
as for (d), i'm not sure whether you're allowed to insert "not" between "enough" and "to".
i also find something a bit awkward about the use of "unable" to describe something that's not actually an inability of the subject.
this plant is unable to perform photosynthesis.
legitimate, because this actually describes an inability of the plant itself.
this sentence:
they (= major economic shifts) are unable to be distinguished...
！ we're not actually talking about an "inability" possessed by the economic shifts themselves.
unable的主语必须是能够做这个动作的。
unable to 主语是经济转折 感觉语义成了经济转折主动发生动作
C错在Unable的用法我感觉
so as+adj+to do固定搭配
be able to 不能接被动语态
(C) unable to be done结构错误。
本题难度主要存在于选项(A)和选项(C)的判断。这里总结一下关于so as to和so that在字面上的区别。so…that可以用作多个主语时，so前面的主语和that后面的主语可以不一样，例如：
I set up the computer so that they could work from home.（我把电脑设置好，这样他们就可以在家办公了。）
so as to要求so前的主语和as to身后动作的主语相同。例如：
I set up the computer so as to do my work. （我把电脑设置好以便完成我的工作）
此时，do my work的主语必须是I。
i also find something a bit awkward about the use of "unable" to describe something that's not actually an inability of the subject.
here's what i mean:
this plant is unable to perform photosynthesis.
legitimate, because this actually describes an inability of the plant itself.
so...as to...和so...that...的区别，注意so可以体现因果的逻辑
不过我有一个疑问，如果按照不定式和从句的逻辑，那so...that...这个句型不就不会存在吗？这个句型本来就是描述一个事情慢慢变化以至于导致了另外一个状态，所以这个句型本来就是主观变化的，可是它还是用that啊
OG10-171. In 1527 King Henry VIII sought to have his marriage to Queen Catherine annulled so as to marry Anne Boleyn.
(A)so as to marry
(B)and so could be married to
(C)to be married to
(D)so that he could marry
(E)in order that he would marry
Key: D
请问这道题为什么选择D
This is 100% grammatically correct. I think the rhetorical emphasis on the subject makes it clear who will do the marrying. Let's say this one is 90% clear.
If we didn't mention the queen, that would be 100% correct
Ron的解释，认为so as to...是接的indirect intention，而这句里marry Anne是King sought to have marriage to Queen annulled的direct intention，所以这种情况下应该用so that...会比so as to好。
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（5） can有被动语态,主语为人或物皆可,而be able to只接不定式的主动形式,不接表示被动的不定式,也不可用无生命的名词作主语.例如：
The work is able to be done by him.（误）
He is able to do the work.（正）
这个解释看起来舒服多了
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不定式表达一种状态的转换，从句表达一种状态的稳定。句中说”at first"怎么样，所以倾向于表达状态从起初到后来的变化。
在表示目的时，so that后接从句，相当于in order that. so as to 后接动词原形，相当于in order to. 但是so as to不能放在句首。例如：
They set out early in order that /so that they could catch the first bus.
= They set out early in order to /so as to catch the first bus.