Notional grammars define adverbs as “words that describe verbs, adjectives, other adverbs, and clauses.” An adverb phrase consists of an adverb plus any modifiers.
Grammatical Forms
Grammatical Form of English Adverbs: Positive, Comparative, and Superlative Adverbs explains the internal structures that distinguish adverbs from other grammatical forms, which includes three degrees of modification.
English Adverbs Dictionary lists common adverbs in the English language.
Grammatical Forms of English Adverb Phrases explains the internal structure of adverb phrases in English.
Grammatical Functions
Grammatical Functions of English Adverbs and Adverb Phrases explains the eight grammatical functions of adverbs and adverb phrases in English grammar.
Using Adverbs as Adverb Phrase Heads exemplifies adverbs performing the grammatical function of adverb phrase head.
Using Adverbs and Adverb Phrases as Adjective Phrase Modifiers exemplifies adverbs and adverb phrases performing the grammatical function of adjective phrase modifier.
Using Adverbs and Adverb Phrases as Adverb Phrase Modifiers exemplifies adverbs and adverb phrases performing the grammatical function of adverb phrase modifier.
Using Adverbs and Adverb Phrases as Verb Phrase Modifiers exemplifies adverbs and adverb phrases performing the grammatical function of verb phrase modifier.
Using Adverbs and Adverb Phrases as Prepositional Phrase Modifiers exemplifies adverbs and adverb phrases performing the grammatical function of prepositional phrase modifier.
Using Adverbs and Adverb Phrases as Adjunct Adverbials exemplifies adverbs and adverb phrases performing the grammatical function of adjunct adverbial.
Using Adverbs and Adverb Phrases as Disjunct Adverbials exemplifies adverbs and adverb phrases performing the grammatical function of disjunct adverbial.
Using Adverbs and Adverb Phrases as Conjunct Adverbials exemplifies adverbs and adverb phrases performing the grammatical function of conjunct adverbial.
For information on adverb clauses, see English Adverb Clauses.