What's the Criteria?

There were very few mistakes, very little indication that you weren't a native speaker as regards pronunciation. In fact, for most of the time listening to you, I thought you could be a native speaker. It was quite difficult for me to say your nationality because we've been teaching for a long time. We kind of know the different accents from first languages that bleed into or come into the way people speak English. But with you, I wouldn't know. So, well done Gaston. Your pronunciation was fantastic, as was your grammar and your vocabulary. And one thing: You said what's the criteria? That's not correct, technically, because the word criteria is strictly plural. Although