Dear brother，
I am writing to express my heartfelt gratitude for thecontinuous assistance you offered to me these years。
On the one hand，your generous help made it possible that I can gain a splid academic achievement in my study career。 It is because of your encouragement that now I can study in one of the leading universities of our country，and serve as chairman of Student Union。 On the other hand，with your help，Icould get along well with my fris and have good cooperation with other members during work.I will always remember your kindness and painstaking labor.Besides，It is really an honor for me to be your sister and I will cherish the goodwill you showed to me wherever I go。
In a word，my appreciation to you is beyond words。 In the years to come，I will make more effort to repay your kindness and refresh ourfamily affection。
Yours sincerely，
Li Hua