"Look, Iain! You do not have trousers on!"
Translation:Seall, Iain! Chan eil briogais ort!
orm and ort are what are called prepositional pronouns, and they're an important part of Gaelic grammar. A prepositional pronoun is an amalgamation of a preposition and a pronoun - so here orm is a combination of air (on) + mi (me), and ort is a combination of air (on) + thu (you). It's the same idea with agam - aig (at) +mi, agad - aig (at) + thu. Duolingo gradually introduces you to the full range of air+ and aig+ combos, and there are full sets of prepositional pronouns for all the prepositions - you will gradually start to see patterns.