[解析]
Dear Jim,
I can't wait to tell you the good news that I won the first prize in the English Speech Contest held in our school!【高分句型一】I am writing to show my gratitude to you.(介绍比赛结果)
I would always remember that before the contest,you gave me many valuable suggestions about how to perform better during the contest,such as reading English text loudly every morning. 【高分句型二】Besides,your encouragement also made me full of confidence.Thanks to your guidance,I really kept calm and showed the best of myself to others.(回顾Jim对你的帮助)
Without your patient help,I couldn't make such an achievement.Thank you again for your kindness!Best wishes to you!(感谢)
Yours,
Li Hua