Adverb - Wikipedia
https://en.wikipedia.org/wiki/AdverbIn English, adverbs of manner (answering the question how?) are often formed by adding -ly to adjectives, but flat adverbs (such as in drive fast, drive slow, and drive friendly) have the same form as the corresponding adjective. Other languages often have similar methods for deriving adverbs from adjectives (French, for example, uses the suffix -ment), or else use the same form for both adjectives and adverbs, as in German and Dutch, where for example schnell or snel, respectively…
The 7 Different Types of Adverbs (Plus Fun Facts) - Fat ...
https://fatstacksblog.com/types-of-adverbsAdverbs of Number: these are adverbs that answer the question “in what order.”. They include adverbs such as never, lastly, firstly, twice, third, and once. Adverbs of Place: these adverbs answer the question “where,” and they include words such as everywhere, upstairs, away, outside, nowhere, and here.
Kinds of Adverbs – Definition, Types, Explanation and Examples
https://www.vedantu.com/english/kinds-of-adverbsAdverbs are also used to add or modify the meaning of an adjective, a verb, a preposition, a sentence, a clause. We can add more information to the words, using different kinds of Adverbs. Hence, Adverbs are a part of speech and express the manner, time, place, frequency, degree, and much more about a verb.