Dear Dr. Cornelia,
This is to really thank you for your experienced teaching professionalism, based to a very effective teaching method.
I also want to thank you for your personal efforts, in supporting me as a very basic beginner in German, and I do recognize a deep knowledge from your institute to choose all the best learning tools such as textbooks, grammar , exercising media, etc. allowing me to have a first basic, but very clear understanding of German language. Many thanks again.