Either you must stop eating my food from the refrigerator or you must pay me for it. what's is a prepositional n the aentence?

There is a long list of prepositions, and knowing them is necessary in finding the prepositional phrases. Some prepositions include: aboard, about, above, across, after, against, along, among, around, at, as, before, behind, below, beneath, beside, between, belong, by, down, during, except, for, from, in, inside, into, like, near, of, off, on, outside, over, past, since, through, throughout, to, toward, under, underneath, until, up, upon, with, within, and without.

"From" is the preposition on that list, and so the phrase that corresponds to it is "from the refrigerator."