I've noticed that so far, here in Duolingo, they've only used 'is' instead of agus when they use 'seo'. Which brings me to my real question: Why is it 'This is Effie and Archie.' rather than 'These are Effie and Archie.' ?
The dropdown for 'is' here has is / and / are. It's already confusing enough to have an English word in the middle of a Gaelic sentence, but here, you have the first thing on the dropdown being wrong, given the answer required. Could you please FIX THIS?