Dear classmate,
A while ago I borrowed your textbook for an educational purpose. Your textbook was really helpful to fulfill gaps in my knowledge. Unfortunately, your textbook was accidently damaged. I am really sorry for damaging your book, I was my fault. It was a sunny day, I left the book next to the loupe and went to have some snacks. The sun ray went through a loupe and was heating the book for a while before it set on fire. I tried to save it, but it was too late. I will buy a new one if you do not mind.
Your classmate A.
