Find some time to read about possessives with gerunds. The question is also dealt with, but in more depth, in this text titled Do I hate your singing or you singing? What do you think of this blog post which defines great teachers by saying they don't teach? The writer in fact suggests that they do something else. What is it? What do you think of the blogger's definition of great teachers? Do you agree? Be prepared to argue in favour or against his views next week.