Misterduncan Lessons Lesson 20. More Slang December 31, 2010December 31, 2010 admin English Learning Online Video Lessons. English-Lesson Twenty (More Slang) In this lesson we look at more slang terms. Spread the love: Related English Lessons Misterduncan Lessons Lesson 19. RULES November 23, 2010 admin Misterduncan Lessons Lesson 18. Small Talk October 7, 2010October 15, 2010 admin