The only other tenses commonly used are the conditional/future and their meaning is approximately the same of the present/preterit imperfect described herein.
en.wikipedia.org The preterite form "would" is used in some conditional sentences, and as a past form of future "will" as described above under.
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 Six morphological forms for tenses, aspects, and/or moods present, preterite, imperfect, pluperfect, future, and conditional.: 6.
en.wikipedia.org These were originally aspectual, but developed into something more like a preterite and future.
en.wikipedia.org