It is not realistic to make Putonghua compulsory for teachers and students in Hong Kong. As Hong Kong has been a colony of British, most people in Hong Kong are native English or Cantonese speakers. They are not familiar to Putonghua. In 1980s, Putonghua was not a compulsory subject for students. At that time, Putonghua was not important at all. In early 1990s, Putonghua has been made compulsory for all students, in order to prepare …showed first 75 words of 419 total…

…showed last 75 words of 419 total…in a linguistically diverse city with numerous languages. To speak in Putonghua is not the only way in creating national identity. There are many other ways, like to have civic education, books, games, etc. To make Putonghua compulsory will only create troubles and difficulties for teachers and students. You should beware of suffering from being too smart. As a conclusion, it is not realistic to make Putonghua compulsory for teachers and students in Hong Kong.