After reviewing all the individual vowels, let’s take a deep breathe. Now, the diphthongs are coming. What is a diphthong? It’s a sound that is the subtle combination of two vowel sounds within the same syllable. That means each diphthong consists of two vowel sounds that we learned in the previous lessons. Again and again, I will refer back Rachel’s English (including her video channel) and Mandy’s pronuncian.com podcast. Now, we’re going to learn about 6 sounds and because it can be a lot to absorb, I suggest you break it into 3 parts.