Ancient Greek verbs have four moods (indicative, imperative, subjunctive and optative), three voices (active, middle and passive), as well as three persons (first, second and third) and three numbers (singular, dual and plural).
- In the indicative mood there are seven tenses: present, imperfect, future, aorist (the equivalent of past simple), perfect, pluperfect, and future perfect. (The last two, especially the future perfect, are rarely used).
- In the subjunctive and imperative mood, however, there are only three tenses (present, aorist, and perfect).
- The optative mood, infinitives and participles are found in four tenses (present, aorist, perfect, and future) and all three voices.
The distinction of the "tenses" in moods other than the indicative is predominantly one of aspect rather than time.