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.)

• He walked.
• He walked quickly.

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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.

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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.