The word "yesterday" is used as an adverb and also a noun.
Some example sentences are:
We went to Bob's house yesterday for some cake, but he ate it all before we got there.
Yesterday was an awful day.
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No, "threw" is not an adverb. "Threw" is the past tense of the verb "throw." An adverb is a word that modifies a verb, an adjective, or another adverb, often describing how, when, where, or to what extent something happens. Examples of adverbs include "quickly," "yesterday," and "very."
Does is a verb, not an adverb.
Yes, an adverb modifies a verb.
verb
before the helping verb