As is the case in other Slavic languages, Bulgarian verbs have a rich inflection, and derived verbs can be obtained by applying various prefixes and suffixes. The goal of this appendix is to give the reader a high-level, rather than comprehensive and detailed, view of the Bulgarian verb system. It should be sufficient background for understanding the elements of a Bulgarian verb entry on Wiktionary.
Bulgarian verbs are inflected for person, number, tense, mood and evidentiality. Participles (and tense forms using participles) are also inflected for gender and sometimes definiteness.
Verbs have lexical aspect. Furthermore, they can be reflexive, transitive, intransitive or bitransitive. (Bi-)transitive verbs can be in the active or passive voice. There are four auxiliary verbs - съм (sǎm), бъ́да (bǎ́da), би́вам (bívam) and ща (šta).
Verbs are inflected for three persons and two numbers (singular and plural), as in English.
There are nine tenses: present, past imperfect, past aorist, present perfect, past perfect, future, future in the past, future perfect, future perfect in the past. Bulgarian is one of few Slavic languages to retain the use of the aorist in everyday speech.
There are four (or three, depending on analysis) moods: indicative (unmarked), imperative, conditional and renarrative. Within Slavic languages, the renarrative mood is unique to Bulgarian and Macedonian. Some authors treat it as part of the evidential system, rather than a separate mood.
Bulgarian verbs have four evidential forms, reflecting the speaker's attitude towards the source of information or the veracity of the information:
Along with Macedonian, and unlike the remaining Slavic languages, Bulgarian does not have an infinitive. Dictionaries, including Wiktionary, lemmatize Bulgarian verbs using the first-person singular form in the present tense, indicative mood - e.g. "I read", "I walk".
Bulgarian monolingual dictionaries, as well as Wiktionary, indicate a verb's lexical aspect, as well as its aspect "partner" - the verb with the opposite aspect - if one exists. Explanatory dictionaries normally list word senses under the imperfective verb, and the provided quotations may use either the imperfective or the perfective verb in the pair.
Bulgarian monolingual dictionaries indicate the transitivity of verbs directly on the headword. We do it in the title of the conjugation table.