-ann

Etymology
From, where it was a third-person singular present ending. It started as part of the root in verb forms like, , , ,  and was later reinterpreted as an ending. This -nn originates in the Old Irish class B IV presents in, before that from the Proto-Celtic presents in , and finally from the Proto-Indo-European nasal infix presents in , which are formed from roots with a final laryngeal. See.

Usage notes

 * This form is attached to first-conjugation verbs ending in a broad consonant;
 * Used with the second person singular and plural, and third person singular and plural, followed by the pronouns, , , , and :