Learn English - Level 9: Advanced Audio Course [Download] Lesson Description detailing the background of the lesson and the grammatical focus Main Audio Track (approx. 10-15 minutes). Listen to the lesson dialog and master the vocabulary and grammar point as your two expert teachers guide you through the lesson Line-by-Line Audio. Master listening comprehension and understanding of the dialog Grammar Point. Detailed explanation of the focal point of the lesson written by expert teachers Vocabulary List. Learn new vocabulary and pronunciation with the audio playback tool