This document discusses adverbials and related grammatical concepts. It defines adverbials as words, phrases, or clauses that modify verbs or adjectives by providing additional information about aspects like time, place, manner, etc. There are different types of adverbials including prepositional phrases, adverb phrases, and noun phrases. Adverbials can function as adjuncts within the verb phrase by giving optional extra information. The document also discusses the levels of the verb phrase, the mobility of adverbials, phrasal verbs, and ellipsis.