It can be either. If it takes a noun as an object, it is a preposition. It if stands alone or with other adverbs, it is an adverb. It can, rarely, be an adjective.
It is an adverb. It cannot be a preposition. It may be considered a noun in some uses.
On can be an adverb a preposition or an adjective. adverb - Turn the lights on. adjective - The switch is in the on position. preposition - I'll see you on Sunday.
No. Almost is an adverb. It is not used as a preposition.
It can be either. If it has a noun as its object, it is a preposition. Standing alone, it is an adverb (and possibly an adjective). It can also be a conjunction.
No. The word much can be an adjective or an adverb. But it cannot be a preposition.
No, it is not a preposition. It is an adverb.
It can be a preposition or more rarely an adverb. Preposition : It is in the house. Adverb: The man came in.
No, it is not a preposition. Tall is an adjective and possibly an adverb.
It is never an adverb. It is always a preposition. The word "within" can be an adverb or a preposition, and the word "forthwith" (immediately) is an adverb.
It is never an adverb. It is always a preposition. The word "within" can be an adverb or a preposition, and the word "forthwith" (immediately) is an adverb.
preposition
Adverb: I had a hat on. Preposition: I didn't have any money on me.
In this adverb form of "with" meaning "accompanying," along is an adverb and with is a preposition.
It can be either. It can be a preposition, or it can be an adverb (walking about), or even possibly an adjective (up and about).
No, it is not a preposition. Usually is an adverb.
No, it is not a preposition. Furthermore is an adverb.
No. It is not a preposition. Twice is an adverb.