Tense:
* Present: -ti (1st person singular), -si (2nd person singular), -ti (3rd person singular), -mos (1st person plural), -te (2nd person plural), -nti (3rd person plural)
* Aorist: -t (1st person singular), -s (2nd person singular), -t (3rd person singular), -mes (1st person plural), -te (2nd person plural), -nt (3rd person plural)
* Perfect: -a (1st person singular), -a (2nd person singular), -a (3rd person singular), -mes (1st person plural), -te (2nd person plural), -re (3rd person plural)
* Imperfect: -t (1st person singular), -s (2nd person singular), -t (3rd person singular), -mos (1st person plural), -te (2nd person plural), -nt (3rd person plural) (often formed by adding *-e- to the aorist stem)
* Future: -si (1st person singular), -si (2nd person singular), -ti (3rd person singular), -mos (1st person plural), -te (2nd person plural), -nti (3rd person plural) (formed by adding *-si- to the present stem)
Mood:
* Indicative: The basic form, used to describe facts or actions.
* Imperative: Used for commands, requests, or orders.
* Subjunctive: Used to express wishes, possibilities, or hypothetical situations.
* Optative: Used to express desires or hopes.
Voice:
* Active: The subject performs the action.
* Middle: The subject is both the agent and the object of the action, or the action benefits the subject.
* Passive: The subject receives the action.
Person/Number:
* 1st person: The speaker (I/we)
* 2nd person: The listener (you/you all)
* 3rd person: Someone or something other than the speaker or listener (he/she/it/they)
* Singular: One person or thing
* Plural: More than one person or thing
Examples:
* Present indicative active: *bʰer-ti* (he/she/it bears)
* Aorist indicative active: *bʰer-t* (he/she/it bore)
* Perfect indicative active: *bʰer-a* (he/she/it has borne)
* Imperative active: *bʰer-tu* (bear!)
* Subjunctive active: *bʰer-t-e* (let him bear)
* Passive present indicative: *bʰer-o-mai* (I am borne)
* Middle aorist indicative: *bʰer-s-a* (he/she/it bore himself/herself/itself)
It's important to note that this is a simplification of the complex system of verb endings in PIE. There were also variations in the endings depending on the specific verb and other factors. For example, the thematic verbs (verbs with a *-e- between the stem and the ending) had slightly different endings than athematic verbs.
These endings have evolved into the different verb conjugations and endings found in modern Indo-European languages like English, French, Spanish, German, Russian, and Hindi. While the details of how they changed are complex, it's clear that the verb system of PIE was a foundation for the diverse and complex verb systems of its descendants.