What's a preposition again?
Basic location prepositions:
up, down, beside, above, at, behind, below, beside, by, in, in front of, off, on, out, outside, over, to, under
Later developing location prepositions
aboard, across, against, ahead of, along, among, around, beneath, between, beyond, into, near, onto, past, through, throughout, toward, underneath, upon, within
about, as, but, by, from, despite, except, for, like, of, to, with, without
after, at, before, during, since, throughout, till, until, while
Preposition fun is everywhere throughout your day:
Pick 5 objects in the house and put them in different places. Model for the child where the object is using words like "on","in", "under", "next to", and "behind".
Perhaps take pictures and send them to loved ones: help your child add the words like "on", "next to", etc.