In these circumstances, a comma is placed under them at this division, where a rest, or small space, of time is left before you proceed to pronounce the other part, but it must not be imagined that this is a full stop.
Use the comma to separate dependent and conditional clauses introduced by such words as if, when, though, unless the connection be close.
Use the comma to set off appositive expression (see §29, Note 1), or a geographical name that limits a preceding name.
Do not use a comma or other punctuation mark with the parenthesis marks unless it would be required even if there were no parenthesis.
In addition to this, place a comma after the name of the addressee, a comma after the street address, if one be given, and after the name of the town or city.