The adverb is an unchangable part of speech that defines means of action, state or other means.
Unlike other independent parts of speech (e.g. the noun or adjective) the adverb does not have genders, declensions, singular or plural forms.
Adverbs are created by changing other parts of speech like nouns, adjectives and pronouns.
For example:
ніч (night) — вночі (at night): noun — adverb
швидкий (quick) — швидко (quickly): adjective — adverb
мій (my) — по-моєму (roughly means "as for me"): pronoun — adverb
Adverbs can be divided in two main groups:
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Adverbs of quality, quantity and manner.
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Adverbs of time, place, intention and cause.