There are many meanings of the word Down.
The word down can be used as an adverb, adjective, preposition, and noun.
But the words downs, downing and downed are used as verbs.
Does is a verb, not an adverb.
Yes, an adverb modifies a verb.
No, it is a verb ("She downed the glass of milk."), a noun ("a pillow made of down"), and a preposition ("She ran down the hallway."). I suppose it could also be an adjective ("down escalator"), but it is not an adverb, sorry.
verb
before the helping verb
It is not a combined form. The word "down" is an adverb. It can modify verbs such as lay.
Together they can be an imperative sentence (command). But the word "down" is an adverb. The word "sit" is a verb.
No, it is not a preposition. Lie down is a statement made from a verb and an adverb.
The verb is "have rafted" and the adverb is "ever."
"lay" is a verb and "down" is an adverb.
"lay" is a verb and "down" is an adverb.
"lay" is a verb and "down" is an adverb.
Come is a verb.
Isn't is a contraction of both a verb and an adverb. Is (verb) not (adverb).
"Is" is the verb. There is no adverb in the question.
It's an adverb. A verb expresses action, like 'running' or 'breathing', and an adverb modifies parts of speech (mainly verbs and adjectives), and answer questions like 'How?' 'When?' 'Where?' etc.
The word 'stooped' is a verb, the past tense of the verb to stoop.The word 'down' is an adverb, modifying the verb 'stooped'.