Course instruction: 1. Customized lessons. 2. Teaching contents can be adjusted according to the ages, levels, needs and so on. 3. Materials can be varied depends on the levels and learning habits. Communication is allowed before any change. 4. For those students who can not make the classes or are absent frequently, your right of the hours should be given to those who want to actually learn and are responsible for the schedule. 5. The contents of courses should not cover sensitive topics such as personal issues, politics, religions and so on. 6. You are always welcomed to ask questions about the courses, I will give response as soon as possible.