Teachers should understand that each student has the language skills. Therefore, the time to teach teachers must teach, explain, and example of each หลัจากนั้น should check again whether the students understood.
Teachers should understand that each student has the language skills are not equal. Therefore, the time teachers must be taught to clarify details. And examples of each topic. Then maybe you should double-check that they understand.
The teacher should understand that each student has a language skills are not equal. So its time to teach teacher must teach thoroughly explain it clearly. And to instantiate each topic. After should check again that the students understand.