Prepositions are words such as aboard, above, across, after, along, anti, around, as, at, before, beneath, below, behind, beside, by, but, beyond, between, concerning, considering, down, during, except, for, following, like, inside, into, minus, near, off, on, onto, plus, through, to, under, up, upon, with, withought and many more!! in your sentence the prepositions would be on, now, and for that i know of but there could be more!! Hope this helps!!!:)