It can be either. The word "on" can be a preposition, or a standalone adverb (meaning forward). It can also be an adjective.
No, the word "away" is not a preposition. It is typically an adverb that describes movement or distance.
No, it is not a preposition. The word afterwards is an adverb.
No, the word "again" is not a preposition. It is an adverb that describes the repetition or recurrence of an action or event.
No, it is not a preposition. The word presently is an adverb.
No, it is not a preposition. The word even is an adjective or 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.
No, it is not an adverb. The word into is a preposition.
No, the word "away" is not a preposition. It is typically an adverb that describes movement or distance.
No, of is not an adverb. The word of is exclusively a preposition, but sometimes is separated from its object (e.g. what is that bolt a part of?).
The word with is not an adverb; it is a preposition. The word "without" may be an adverb (e.g. to do without, where no specific object is used).
No. The word from is a preposition. However, with a noun object, it can form an adverbial phrase.
No, it is not a preposition. The word afterwards is an adverb.
No, the word "again" is not a preposition. It is an adverb that describes the repetition or recurrence of an action or event.
It is a sentence. The word "on" is an adverb and the word "for" is a preposition.
No, the word "from" is a preposition. It cannot be used as an adverb.
No, it is not a preposition. The word seriously is an adverb.