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Adverb is a word that modifies a verb, an adjective, another adverb, or a sentence, ex., "happily", "very", or "frankly"

* I want it badly.
* She was really pleased.
* He is extremely clever.
* She sings beautifully.

* Adverbs are formed by adding -ly to an adjective. Ex: slow (adj) - slowly (adverb)
* Many adverbs are gradable. Ex: "very softly", "extremely slowly"
* Some adverbs can take comparative and superlative forms, with -er or more and -est or most. Ex. Mary works harder. John works hardest. 
* As a sentence constituent, an adverb or any group of words that can substitute for an adverb is an adverb phrase.
* An adverbial is a word or phrase that functions as an adverb would, modifying verbs, adjectives, adverbs, or the whole sentence.
* An adverbial clause is usually introduced by a subordinating conjunction.
* An adverbial complement is an adverbial word or phrase that completes the meaning of an intransitive verb.
* An adverbial modifier are words that add information about how, when, where, why, or how much something happens.
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Adverb is a word class that modifies something other than nouns. They answer the 4 W's (why, what, where, when) and 1 H (how). It came from the Latin word, "adverbium", ad- (to) and verbum (word).

   They abruptly ran when they heard the signal.
   They ran very fast.
   They ran very quickly.

+ Adverbs mostly ends with "ly".
+ When an adjective and another adverb is modified, they often add most, pretty much, sort of, etc. before it.
+ There are 5 kinds of adverbs.
+ Adverbs use intensifiers.
+ The degrees of comparison.