Dear Professor Garreis.
Thank you for your reply and corrections of my English.
Your lessons included various kinds of knowledge.
You offered me a fun and very beneficial learning time.
Thank you very much.
During summer vacation, I am going to study the business world that I want to work in.
And while on summer vacation, I am going to learn more English.
I will improve my English skills.
I am going to send you some excellent English sentences, after summer.
I am looking forward to your second semester message.
Please have a good summer.
Sincerely.
Atsushi