dear sir :
i am very glad that you are my teacher,you are one of the best teachers who i know 。there are many good points what we should learn you,such as kindness,patience,humor and so on.please forgive me that i had made so many mistakes which make you always angry.i really want to be a good student.thanks for you teaching，i have learn so many interesting things，so many words,so many sentencesform you,ican feel that it is not only a progress of learning,but also a convarcation of feeling .
you are my teacher and good fri, we are the lucky dogs that we have such teacher as you.finally,i hope you happy everyday! best wishes your student
sincerely,