Skywalker18
Skywalker18 , yes.
So can be a subordinating conjunction, but an admittedly limited data survey suggests that GMAC prefers the phrase "so that" over "so."
In formal writing generally,
so is a subordinating conjunction when
so implies purpose or result.
Often the construction is
so that.
I reviewed OG 2020 to ensure that my impression from past reviews of questions was accurate.
A single official guide is not a completely reliable indicator of GMAC's position, but the guide's ~130 questions confirmed what I recalled.
Official guide patterns emerge.-- The word
so is not used alone to suggest consequence or purpose. In formal writing, often we are allowed to drop the word
that, but GMAC does not seem to like the idea of dropping
that.
If "so" seems to be suggesting purpose or causality, do not eliminate the answer on that basis alone unless you are down to two and the other answer uses "so that."
In other words, it is possible but unlikely that
so has been used
alone (or could be used alone) as a subordinating conjunction.
-- Language in the official explanations refers to
so that as a causal phrase and thus indicates in a roundabout way that
GMAC considers so that a subordinating conjunction. Examples are beneath the spoiler.
Spoiler alert: to discuss
so that, I reveal five incorrect answers from four official questions.
So that is a subordinating conjunction in #778(D), 839(B), 862(D), and 883(D and E).
All: The questions are
here.
• Not one of those answers is correct, BUT
• not one of the OEs says, "SO THAT is not a subordinating conjunction."
• Quite the opposite seems to be the case:
so that is characterized as expressing consequence or causality—and thus is a subordinating conjunction. From OG 2020:
-- 778(D): so that the companies seem larger
OE: Clauses beginning so that can express purpose, but [this option is inaccurate on other grounds; the prompt requires the prepositions to or for].-- 839(B) a thick needle layer protects buds from where new growth proceeds, so that they can withstand forest fires relatively well
OE: In this context, needle layer is less precise than the more standard layer of needles, which makes it clear that the layer is composed of needles rather than being, for example, a layer of needles. From where is . .. redundant in using two words that express the idea of location (from and where) instead of one.No mention of SO THAT-- 862D) companies, so that they rarely hold more than one percent
OE: The singular pronoun they refers to a mutual fund and thus should be singularNo mention of SO THAT
-- 883 (D and E)
(D) so that compared with previous Novembers, sales of light trucks this past November
OE: The sentence illogically compares sales of light trucks with previous Novembers. The conjunction so that nonsensically introduces a causal relationship between November's typically strong sales and the aforementioned comparison.(E) so that this past November’s sales, even compared with previous Novembers’ sales,
OE: Like (D), [so that in] this sentence introduces a nonsensical causal relationship, in this case [between different but also incorrect things.] Other sources that confirm the usage of
so that as a subordinating conjunction.
Oxford Online Dictionary (1.1)
, here. The example sentence is
It was overgrown with brambles, so that I had difficulty making any progress. The sentence means:
Because it was overgrown with brambles, I had difficulty making any progress.
Cambridge Online Dictionary states,
We use so as a subordinating conjunction to introduce clauses of result or decision. Scroll down to
So as a conjunction, HERE.So is described as a "weird" conjunction in this article,
HERE, in which the author notes, "When
so shows purpose, it acts like a subordinating conjunction."
Controversy exists about
so, standing alone, as a subordinating conjunction; that fact that may inform your question.
GMAC seems to avoid the issue and to use
so that rather than
so.
Hope that helps.