Bulgarian verbs
Bulgarian verbs are the most complicated part of Bulgarian grammar, especially when compared to other Slavic languages. They are inflected for person, number and sometimes gender. They also have lexical aspect (perfective and imperfective), voice, nine tenses, three moods, four evidentials and six non-finite verbal forms. Because the subject of the verb can be inferred from the verb ending, it is often omitted. As there is no infinitive in the contemporary Bulgarian language the basic form of a verb is its present simple tense first person singular form.
Conjugations
There are three conjugations. Of which conjugation of a verb is determined by the final vowel, in which the verb ends in the third person singular present simple tense. Verbs of the first conjugation end in e, of the second in и and of the third in а or я.
Aspect
Bulgarian verbs express lexical aspect (вид). The verbs are either of imperfective (глаголи от несвършен вид) or perfective (глаголи от свършен вид) aspect. The former describe actions in progress (uncompleted actions) and the latter whole completed actions (actions which have a beginning and an end). So in Bulgarian an English verb is usually translated by two verbs (or sometimes by even three, see below). Perfective verbs can be usually formed from imperfective ones by suffixation or prefixation, but when prefixes (or very rarely suffixes) are used the resultant verb often deviates in meaning from the original. It is better to learn the pairs of verbs by heart because there are not any strict rules and irregularities are very common. Nevertheless many verbs can be grouped according to their stem change:
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