If you don't ask the teacher for leave, the teacher will think that something important has happened to the child and will worry the teacher. You should truthfully report to the class teacher, pay attention to politeness when asking for leave from the teacher, pay attention to words even if it is urgent, and be sincere. When you find the teacher to approve the leave, you should first say hello to the teacher and explain the reason and time of your leave. If the teacher needs to know the situation from your parents, you should cooperate with the teacher and call your parents to explain the reasons. Remember to say thank you after the teacher finally approves to leave. Now many people don't even know how to write fake notes. It's best to write a note in advance before going to ask for leave, which can save some time. If you can't write a note, you should learn to understand the format of the note yourself. Especially the final salute format. Teachers can see whether a person is serious or not and whether the attitude of asking for leave is correct through fake notes. Generally, there is no hurry. Ask for leave in advance, preferably one day or half a day in advance. This is a matter of courtesy, and it is also necessary to prepare in advance. Don't delay the time to go back or go out to work, because you need to ask the teacher for leave, and you should also tell the teacher in advance.