Tenses.—There are seven tenses in the indicative: present, imperfect, future, aorist, perfect, pluperfect, and future perfect. The future perfect commonly has a passive force, but it may be active or middle in meaning (see cross581).
The subjunctive has three tenses: present, aorist, and perfect.
The optative and infinitive have five tenses: present, future, aorist, perfect, and future perfect.
The imperative has three tenses: present, aorist, and perfect.
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].