Editing Tocharian languages (section)

=====Present indicative=====
The most complex system is the present indicative, consisting of 12 classes, 8 thematic and 4 athematic, with distinct sets of thematic and athematic endings. The following classes occur in Tocharian B (some are missing in Tocharian A):
*I: Athematic without suffix < PIE root athematic.
*II: Thematic without suffix < PIE root thematic.
*III: Thematic with PToch suffix ''*-ë-''. [[Mediopassive]] only. Apparently reflecting consistent PIE ''o'' theme rather than the normal alternating ''o/e'' theme.
*IV: Thematic with PToch suffix ''*-ɔ-''. Mediopassive only. Same PIE origin as previous class, but diverging within Proto-Tocharian.
*V: Athematic with PToch suffix ''*-ā-'', likely from either PIE verbs ending in a syllabic laryngeal or PIE derived verbs in ''*-eh₂-'' (but extended to other verbs).
*VI: Athematic with PToch suffix ''*-nā-'', from PIE verbs in ''*-nH-''.
*VII: Athematic with infixed nasal, from PIE infixed nasal verbs.
*VIII: Thematic with suffix ''-s-'', possibly from PIE ''-sḱ-''?
*IX: Thematic with suffix ''-sk-'' < PIE ''-sḱ-''.
*X: Thematic with PToch suffix ''*-näsk/nāsk-'' (evidently a combination of classes VI and IX).
*XI: Thematic in PToch suffix ''*-säsk-'' (evidently a combination of classes VIII and IX).
*XII: Thematic with PToch suffix ''*-(ä)ññ-'' < either PIE ''*-n-y-'' (denominative to n-stem nouns) or PIE ''*-nH-y-'' (deverbative from PIE ''*-nH-'' verbs).

[[Palatalization (phonetics)|Palatalization]] of the final root [[consonant]] occurs in the 2nd singular, 3rd singular, 3rd dual and 2nd plural in thematic classes II and VIII-XII as a result of the original PIE thematic vowel ''e''.