Welcome to the world of Hive, a different social network, I hope you feel good swimming with the fish. I saw your video and I thought it was great how you teach, it is understood. I am Latina and I understand a lot of what you spoke because you speak it slowly and that is important for those who are learning English.
You make it enjoyable with the examples you give, I was taught in my Secretariat studies that AN, it is placed even when the word that follows begins with a vowel and for all the others it is placed A, this in case this tip helps you to add it in your explanation. Thank you for sharing your teachings, I already subscribed to your page, I am always looking for how to practice my English, otherwise I will forget it completely.