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It can be either, because there is no adverb form (fastly) for speed.

A fast car (adjective)

He drove fast (adverb)

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10y ago

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Can an adverb modify an adjective?

Yes, an adverb can modify an adjective. For instance, you could say "I saw a very fast runner." Very, an adverb, modifies fast, an adjective. Another example is "The shelf is too high" where too (adverb) modifies high (adjective).


What is the adjective in the sentence Jacob is really fast?

The adjective in this sentence is "fast"; "really" acts as an adverb.


What is to noun as adverb is to verb?

Adjective verb ; Adverb ;; noun ; Adjective. Adverb describes the action of a verb . 'Very fast' ; 'very' is the adverb to the verb 'fast' Adjective describes a noun . 'red coat' ; 'red' is the adjective to the noun 'coat'.


Is fast an adjective verb or adverb?

Fast can be used as an adjective, a verb, and an adverb. Adjective: That is a fast car. Verb: She fasted for five days to lose weight. Adverb: He drives fast. Fast can also be used as a noun. Example: She went on a five-day fast.


Is fast is adjective?

Yes it is. An adjective is a word that describes a noun. For example, I have a fast computer.It can also be an adverb, as in "He runs fast."Another use of the adjective or adverb is to mean tight or tightly (held fast).In a separate usage, fast is a verb (to not eat, to abstain).


Is speedy an adverb?

No. Unlike fast and slow, speedy is always an adjective. The adverb is speedily.


What is the adverb for fast?

The word "fast" can be an adjective (speedy) or an adverb (speedily). Other adverbs that mean fast are quickly, rapidly, and expeditiously.


Can an adverb follow a state of being verb?

No. A modifier that follows a state of being (linking) verb is an adjective. The car is fast. (adjective) The car drove very fast. (adverb)


What is the word that describes another word?

An adjective describes a noun... ex. The Big ant bit me. Big is the adjective. An adverb describes a verb... ex. I was running fast. fast is the adverb


How do you use fast as an adverb?

Fast can be both an adjective and an adverb for "moving fast" (rapid, rapidly), and for "held fast" (secure, securely). The car drove fast. (adverb) The line must be tied fast to the pier. (adverb) * The form fastly, when used, refers to this second meaning.


Which is the adjective in the sentence- Sal cannot run as fast as Ace.?

There is no adjective in that sentence. The word "fast" is sometimes used as an adjective, but in this sentence it modifies the verb "run," so "fast" is an adverb.


Is fastly an adverb?

Yes,it is an adverb, but it has nothing to do with speed. Fastly means securely, as in made fast (tightly attached or anchored). The adjective fast (quick) is also an adverb (quickly).