Thank-you Letter

词汇：

appreciate感激

convey / express ones appreciation表示感激

cordial衷心的

beyond words难以言表

courtesy礼貌

generosity慷慨

grateful感谢

gratitude感激之情

hospitality好客

moved感动

timely及时的

句型：

1) I take this opportunity to express to you my deep appreciation for the kind assistance you rendered me.

2) I wish there were a better word than thanks to express my appreciation for you generous help.

3) My appreciation to you for your generous help is beyond words. I wish I could repay it one day.

4) Please accept my most cordial thanks for your timely help, which I will always remember.

5) Thank you from the bottom of my heart for your kind help.