* Prepositions can be tricky: The line between prepositions and other word categories (like adverbs) can blur.
* New prepositions emerge: Language evolves, and new prepositions can emerge over time.
* Phrasal prepositions: There are combinations of words that act as prepositions (e.g., "according to," "in spite of").
However, there are a few common prepositions that make up the majority of usage:
* Simple prepositions: about, above, across, after, against, along, among, around, at, before, behind, below, beneath, beside, between, beyond, by, down, during, for, from, in, inside, into, near, of, off, on, onto, out, outside, over, past, since, through, throughout, to, toward, under, underneath, until, up, upon, with, within, without.
It's important to remember that these lists are not exhaustive. There are many other prepositions, and even a single word can function as a preposition depending on its context.