Given for reference are some tenses of the indicative (these are the imperfect, aorist, perfect, future in the past and future perfect in the past).
en.wikipedia.org An exception occurs when a completed action is reported in any of the past tenses (simple past, past progressive, present perfect or past perfect).
en.wikipedia.org The present and past singular stem was extended to the plural, leaving the reduplication as the only change in the stem between the two tenses.
en.wikipedia.org Conjugation includes three persons, two numbers (singular and plural), three moods (indicative, imperative and subjunctive), and two tenses (present and preterite).
en.wikipedia.org For simplicity, the table below has only the full conjugation of the present tense, and the first-person singular forms of some other tenses.
en.wikipedia.org