"Ciamar a tha thu a charaid?"
Translation:How are you, friend?
'Friend' is 'caraid' in the nominative and 'a charaid' in the vocative. 'My friend' is 'mo charaid' literally translated. English doesn't have a vocative case which is why 'a charaid' could be translated into English as 'my friend', but we need to make the difference between the possessive mo charaid and the vocative a charaid clear to learners.