TETB Sound out, this App was developed by experienced adult literacy professionals for adult learners. Phonics involves matching sounds of spoken English with individual letters or groups of letters. We use a phonics approach to teaching reading, encouraging you to identify and use sounds of individual letters and blends of letters, to read words. Understanding phonics will also help you to know which letters to use when you are writing words. Go through the features of the App at your own pace and have fun learning!