Sillybore Has Done It Again. He Cancelled A Class Because

"Sillybore has done it again. He cancelled a class because he forgot his notes. A teacher who knew his subject could carry on a class even without his notes. A teacher who knew his subject would find things to discuss in the text, but Sillybore can't discuss the points in the text, because he doesn't understand them."Sillybore cancelled a class because he forgot his notesA teacher who knew his subject could carry on a class even without his notesIf he knew his subject, he would find things to discuss in the textTherefore, doesn't understand his notes321 4+