My dear friend:
I am quiter sorry for not talking to you for so many days.That day you lost my book,and it was my favorite book.It was the present my father bought me during my birthday,so I was really a little angry at that time.Howevwer,I shouln't be rude to you.I remember when I was in trouble ,you always helped me actively.And last Sunday you wasn't angry with me when I broke your bike .From here I know that I should forgive you .Would you please forgive me too?We are still good friends!
Yours