v. is, are, am, present or past tense conjugation of kos

Dovahkiin, Dovahkiin, naal ok zin los vahriin, wah dein vokul mahfaeraak ahst vaal!
Dragonborn, Dragonborn, by his honor is sworn, To keep evil forever at bay!
(Book, Songs of Skyrim)

Rok los Dovahkiin, Strundu'ul.
He is Dragonborn, Stormcrown.
(Einarth, 000B3980)

Thu'umii los nahlot.
His Voice is silenced.
(Dragon, 0009E072)

Nii los heyv do enook mun wah lahney voth ahkrin ahrk zin leh rok feim vodahmin kotin vulom.
It is duty of each man to live with courage and honor lest he fade unremembered into darkness.
(Word Wall for Feim, Become Ethereal)

Qethsegol vahrukiv kiir jun Jafnhar wo los ag nahlaas nal yol do lot dovah Lodunost.
This stone commemorates the child king Jafnhar, who was burned alive by the Fire of the great dragon Lodunost.
(Word Wall for Yol, Fire Breath)

Sigruuf wahlaan qethsegol briinahii vahrukt Lanal wen brit luft los ol kinzon ahrk sot ol nus dwiirok nol nahlaas ozinvey.
Sigruuf raised this stone for his sister, Lanal, whose beautiful face was as sharp and white as a Statue, carved from living ivory.
(Word Wall for Nus, Ice Form)

Always indicates present tense in spoken dialogue. On Word Walls may be used for past or perfect, as well as present tense.

From kos ‘be’.

Typically omitted from regular speech (as in Alduin mahlaan ‘Alduin (is) fallen’, rok mul ‘he (is) strong, and nu hin sil dii ‘now your soul (is) mine’). May be used to create emphasis.