1) Spend a hundred dollars and get 10% off
2) Approximately, on Black Friday you get 25% off any item you buy.
As I know, that most prepositions have dual functions: as a preposition if it is followed by object or as an adverb if nothing comes after. Please, correct if I am wrong.
- Yesterday, I walked down the street (preposition)
Hey buddy, do you know where I can find this store?
Yes, it is a couple of streets down (adverb)
Does off in the first (1) sentence act as an adverb because nothing follows it? Or does it act as a preposition in the second sentence (2) as it is followed by an object “any item”.