?Turn (Rotate) the inside surface to become the outside surface.Andrew Patterson wrote:Surely "out" is a preposition. Here "out" is the opposite of "in" and "in" is clearly a preposition. If "out" is its opposite it is also a preposition. This of course only works with this sense of "out". In the sentence, "You're out!" (Someone caught the ball, etc.) "out" is an adjective.
I accept that "inside out" is a compound adverb although I do not think that it is necessary for any part of a compound adverb to be an adverb for the compound to be an adverb.
I'm still reserving judgement on what part of speach "inside" is.
Inside/outside becomes an adjective.