(demonstrative) The thing, person, idea, quality, event, action or time indicated or understood from context, especially if more remote geographically, temporally or mentally than one designated as "this", or if expressing distinction.
Introducing a clause which is the subject or object of a verb (such as one involving reported speech), or which is a complement to a previous statement.
Introducing a subordinate clause that expresses an aim, purpose or goal ("final"), and usually contains the auxiliaries may, might or should: so, so that.
Introducing — especially, but not exclusively, with an antecedent like so or such — a subordinate clause expressing a result, consequence or effect.