Teacher Wu, Teacher Zhang, Teacher Sun, and Teacher Su are all teachers in a certain school, and each only teaches one course in Chinese, biology, physics, and chemistry  It is known: ①If Mr  Wu teaches Chinese, then Mr  Zhang does not teach biology ②Or Mr  Sun teaches Chinese, or Mr  Wu teaches Chinese ③If Mr  Zhang does not teach biology, then Mrs
Su also does not teach physics ④Or Mr
Teacher Wu teaches chemistry