Dear Jeff,
2 weeks working with you is not enought time for you to transfer all knowledge to my class, the things you gave us are very useful in our job, I wish we have more time working together. We are going to say goodbye, I feel sad more, but dont know what to do, maybe you do not belived but but I am sure, today is the lastday we work together,so we will have alot of thing to discuss in the conferent this morning ,some of my classmates said yesterday that, you were a litter angry when they asked alot,but i do not think so , the more they ask the more you are sucessful in you job, because when they ask it means that they are working. There are something wrong with students in Vienam, when they do anything they want to know the result immediately, want to check is it ok or not, if not they do it again,I know you do not everything at the same time, so you can not answer at one, I know that , and me too. See you on 9.30 a.m in the class this morning

sincerely yours
toloan