dear______：
i am writing toextend my sincere gratitude for _________ (感谢的原因). if it had not been for yourassistance in ___________ (对方给你的具体帮助), i fear that i would havebeen_________(没有对方帮助时的后果).every one agreesthat it was you who______________(给出细节).again, i would like to express my warmthanks to you! please accept my gratitude.
yours sincerely
你的姓名
extend [kstend]
vt. 延伸；扩大；
推广；伸出；给予；使竭尽全力；对?估价 vi. 延伸；扩大；伸展；使疏开
gratitude
n. 感谢（的心情）；感激
assistance
n. 援助，帮助；辅助设备