✔ 最佳答案
Dear mrs. xxx/mr xxx
I was very sorry that I'd forgotten to bring my english book to school due to personal forgetfullness. I would hope to be forgiven for being still that ineffective in secondary life. Apart from apologizing, I would also ensure you I will never repeat my cloddish, careless mistake.
Thank you for being determined to have me writing this apology letter or else I would never learn to correct my mistakes.
Yours sincerely,
(your name)