I didn't send a text message asking the teacher to forgive me ... how to send it ... sincere attitude ... thank you.

Hello, teacher, I failed the exam because of my carelessness and mistakes, but I hope you don't lose confidence in me. From now on, I will work hard, study hard and try not to let you down ... well, that's probably it. Generally, the teacher will forgive you if you add some points yourself (in short, you will forgive me every time you say that). I hope your teacher will forgive you …