No, it is not a preposition. Thirty is a number, used as an adjective, noun, and pronoun.
The word "wait" is never an adverb or preposition. It could be used as an interjection ("Wait!"), but in normal use, "wait" is a verb or noun.
Stairs is a noun. "Sharon had to walk (verb) up thirty seven flights of stairs (noun)."
No, then is not a preposition. It is a conjuction.Than is a preposition.
No, then is not a preposition. It is a conjuction.Than is a preposition.
If is not a preposition. It is a conjunction.
No,a preposition does not have to have a preposition phrase,but a prepositional phrase does have to have a preposition
The object of the preposition follows the preposition.
At is a preposition. Anything that can be ___ the box is a preposition. For Example: At the box.
No, it is not a preposition. It is an adverb.
flew is not a preposition. sorry but through is a preposition
its a preposition
Yes, into is a preposition.