求写一英语电子邮件 假设你是李华,请根据以下要点给你已经回到美国的老师Mrs Smith写一封电子邮件.

Mrs. Smith,
Thank you for your instruction in my last semester. I have achieved a great grogress and got excellent score in the final exams. Sometimes I feel the English grammer is dificult for me the command. Could give give me some advice to improve it.
Hope to hear from you soon. Thanks again.
Sincerely,
Hua Li