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  Known: ①If Mr  Wu teaches Chinese, then Mr  Zhang does not teach students 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 Mrs
Wu does not teach chemistry, Or Mr
Teacher Zhang does not teach biology