For the first time in history, the complete conjugations of 5 major derived (D) active indicative tenses of thematic verbs in Linear B progressive grammar:
The tenses of active thematic verbs are:
the present indicative active
the future indicative active
the imperfect indicative active
the aorist indicative active
the perfect indicative active
Here is are the 2 tables (A & B) of the complete derived (D) conjugations of these 5 tenses of the active thematic verb kaue = the archaic ancient Greek kauein (Latinized), “to set on fire”:
The ability of a linguist specializing in Mycenaean Linear B, i.e. myself, to cognitively restore no fewer than 5 active tenses of thematic verbs by means of progressive Mycenaean Greek derived (D) grammar boils down to one impressive feat. However, I have omitted the pluperfect indicative active, since it was rarely used in any and all of the numerous dialects of ancient Greek, right on down from Mycenaean to Arcado-Cypriot to Aeolic, Ionic and Attic Greek, and indeed right on through the Hellenistic and New Testament eras. So since the pluperfect tense is as rare as it is, why bother reconstructing it? At least, this is my rationale. Other researchers and linguists specializing in Mycenaean Linear B may disagree. That is their perfect right.
Is Mycenaean Greek in Linear B a proto-Greek dialect? Absolutely not!
There are still a few researchers and historical linguists specializing in Mycenaean Linear B who would have us believe that Mycenaean Greek is a proto-Greek dialect. Nothing could be further from the truth. The fact that so many fully developed grammatical forms are attested (A) on Linear B tablets confirms once and for all that Mycenaean Greek is the earliest intact East Greek dialect. Among the numerous grammatical forms attested (A) in Mycenaean Greek, we count:  verbs, including infinitives active and some passive for both thematic and athematic MI verbs; a sufficient number of verbs either in the active present or aorist tenses; a considerable number of participles, especially perfect passive; and even the optative case in the present tense,  nouns & adjectives, for which we find enough attested (A) examples of these declined in the nominative singular and plural, the genitive singular and plural and the dative/instrumental/ablative singular & plural. The accusative singular and plural appear to be largely absent from the Linear B tablets, but appearances can be deceiving, as I shall soon convincingly demonstrate. Also found on the extant Linear B tablets are the comparative and superlative of adjectives, and  almost all of the prepositions to be found in later ancient Greek dialects. Taken altogether, these extant attributed (A) grammatical elements form a foundation firm enough to recreate templates for all of the aforementioned elements in a comprehensive derived (D) progressive Mycenaean Linear B grammar. If you are still not convinced, I simply refer you to the previous post, where examples of many of these grammatical elements are accounted for. Moreover, once I have completely recompiled ancient Mycenaean Greek grammar, you should be convinced beyond a shadow of a doubt that Mycenaean Greek was the very first true ancient Greek dialect.
What is progressive derived (D) Mycenaean Linear B grammar?
By progressive I mean nothing less than as full a restoration as possible of the corpus of ancient Mycenaean Greek grammar by means of the procedure of regressive extrapolation of the (exact) equivalents of any and all grammatical elements I shall have reconstructed from the two major sources of slightly later archaic Greek, namely: (a) the Arcado-Cypriot dialect, in which documents were composed in the Linear C syllabary, a direct offshoot of Mycenaean Linear B (Even though the two syllabaries look scarcely alike, the symbolic values of their syllabograms are in almost all instances practically identical), and from so-called Epic Greek, which was comprised of diverse elements haphazardly drawn from various archaic Greek dialects, in other words yielding nothing less than a mess, but a viable one nonetheless.
At this juncture, I must emphatically stress that, contrary to common opinion among ancient Greek literary scholars not familiar with either Mycenaean Linear B or Arcado-Cypriot Linear C, the gap between the scribal Linear B tablets and the next appearance of written ancient Greek is not around 400 years (1200-800 BCE), as they would have it, but only one century. Why so? Hard on the heels of the collapse of the Mycenaean Empire and of its official script, Linear B, ca. 1200 BCE, Arcado-Cypriot Linear C first appeared in writing a mere 100 years after, give or take. The revised timeline for the disappearance and reappearance of written Greek is illustrated here:
If this is not convincing enough, Mycenaean Greek’s intimate cousin, Arcado-Cypriot, of which the syllabary is Linear C, is even more closely related to Mycenaean Greek than Ionic is to Attic Greek. In fact, you could say that they are kissing cousins. Now it stands to reason that, if Arcado-Cypriot in Linear C is a fully developed East Greek dialect, as it most certainly is (subsisting at least 700 years, from 1100 – 400 BCE), then it follows as day does night that Mycenaean Linear B must also be a fully functional East Greek dialect (in fact, the first). The two factors addressed above should lay to rest once and for all that Mycenaean Greek is merely proto-Greek. That is sheer nonsense.