The simple description of an adverb is that it is a word added to the meaning of the verb (ad + verb) to qualify the range of the verb in some way. (Less often, adverbs qualify adjectives or another adverb.)

In English, the suffix "ly" is routinely added to adjective forms to create the adverb form. In Greek, a suffix is also often added.
Two suffixes are common. The first is a distinctive form; the second is the accusative singular neuter form of the adjective, which often is used as an adverb.

  1. Adverbs have only one form. (Contrast this to adjectives, which have 24 or more forms, expressing case, gender, and number.)
  2. Adverbs most commonly end in either:
  3. Adverbs add a spot of colour onto the verb. They are not crucial to the fundamental structure of the sentence.