H. L. Mencken

“ Yet again, there is the use of too and so as intensives, as in “You are, too” and “You are, so.” Yet again, there is the growing tendency to omit the verb of action in phrases indicating desire or intent, as in, “he wants out” for “he wants to go out. ”

“ Off’n is a good example; it comes from off of and shows a preposition decaying to the form of a mere inflectional particle. One constantly hears “I bought it off’n John.” Sort’a, kind’a and their like follow in the footsteps of would’a. Usen’t follows the analogy of don’t and wouldn’t, as in “I didn’t usen’t to be.” Would’ve and should’ve are widely used; Lardner commonly hears them as would of and should of. The neutral a-particle also appears in other situations, especially before way, as in that-a way and this-a way. It is found again in a tall, a liaison form of at all. ”