Editing Tocharian languages (section)

====Endings====
As suggested by the above discussion, there are a large number of sets of endings. The present-tense endings come in both thematic and athematic variants, although they are related, with the thematic endings generally reflecting a theme vowel (PIE ''e'' or ''o'') plus the athematic endings. There are different sets for the preterite classes I through V; preterite class VI; the imperative; and in Tocharian B, in the singular active of the optative and imperfect. Furthermore, each set of endings comes with both active and mediopassive forms. The mediopassive forms are quite conservative, directly reflecting the PIE variation between ''-r'' in the present and ''-i'' in the past. (Most other languages with the mediopassive have generalized one of the two.)

The present-tense endings are almost completely divergent between Tocharian A and B. The following shows the thematic endings, with their origin:

{|class="wikitable" style="text-align: center;"
|+Thematic present active indicative endings
! rowspan=2| !! rowspan=2|Original PIE !! colspan=2|Tocharian B !! colspan=2|Tocharian A !! rowspan=2|Notes
|-
! PIE source !! Actual form !! PIE source !! Actual form
|-
| 1st sing || ''*-o-h₂'' || ''*-o-h₂'' + PToch ''-u'' || ''-āu'' || ''*-o-mi'' || ''-am'' || ''*-mi'' < PIE athematic present
|-
| 2nd sing || ''*-e-si'' || ''*-e-th₂e''? || ''-'t'' || ''*-e-th₂e'' || ''-'t'' || ''*-th₂e'' < PIE perfect; previous consonant palatalized; Tocharian B form should be ''-'ta''
|-
| 3rd sing || ''*-e-ti'' || ''*-e-nu'' || ''-'(ä)ṃ'' || ''*-e-se'' || ''-'ṣ'' || ''*-nu'' < PIE ''*nu'' "now"; previous consonant palatalized
|-
| 1st pl || ''*-o-mos''? || ''*-o-mō''? || ''-em(o)'' || ''*-o-mes'' + V || ''-amäs'' ||
|-
| 2nd pl || ''*-e-te'' || ''*-e-tē-r'' + V || ''-'cer'' || ''*-e-te'' || ''-'c'' || ''*-r'' < PIE mediopassive?; previous consonant palatalized
|-
| 3rd pl || ''*-o-nti'' || ''*-o-nt'' || ''-eṃ'' || ''*-o-nti'' || ''-eñc'' < ''*-añc'' || ''*-o-nt'' < PIE secondary ending
|}