I'd guess "until" is a preposition. " I'm up in the air for the time being. I'm gonna be sick all day.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
an adverb modifies a verb that indicates some movementHere's the part that's wrong. An adverb does not have to modify a verb that indicates movement. An adverb can modify any kind of verb or verb phrase or an adjective or another adverb. And an adverb called a sentential adverb can modify a whole sentence.