What is the experience of mainlanders as teachers in Hong Kong?

In Hong Kong, teachers in local schools generally hold several jobs and teach several subjects at the same time. As Chinese in local schools is generally taught in Cantonese, while Putonghua is another subject (in ordinary primary schools, Putonghua is taught in Form 1 to Form 3), but the teachers who teach may be the same person. Therefore, teachers in Hong Kong need to take an additional language certificate before they can hold several posts. At present, some local schools implement "general education", that is, teaching Chinese directly in Putonghua. On the other hand, international schools will have specialized Putonghua teachers.