I gave up on trying to get anything useful from his tonal system, when checked my records and seen examples of tone 4 as arrow up, tone 5 as arrow down, and tone 6 randomly either up or down. I guess for people with not very high standard for teaching, that are looking to have few laughs and remember literally dozen of words plus after class socialising that’s about right. But if you really interested to get accurate knowledge avoid him at all cost. You’re not the first people so fond of William, there’re more in his class. Common feature is that these people don’t know many words and are inaccurate with the tones as much as possible, and never attended classes with other teachers…