frequency)
*He undoubtedly did it (undoubtedly modifies the verb phrase did it, indicating certainty)

Adverbs can also be used as modifiers of adjectives, and of other adverbs, often to indicate degree. Examples:
* You are quite right (the adverb quite modifies the adjective right)
* She sang very loudly (the adverb very modifies another adverb - loudly)

They can also modify determiners, prepositional phrases,

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