So
“So” is best known as an adverb, but it can also be seen in the role of a conjunction. In the question of so versus such, remember that “so” can never be used as an adjective. If the word being described is a noun or pronoun, “so” cannot be used, as it can only modify adjectives and other adverbs.
- See more at: http://www.grammar.net/such-and-so#sthash.fzOq1xrV.dpuf