1. I am grateful / obliged to you for …

　　我非常感謝你的……

　　2. I am greatly indebted to you for what you have done.

　　我為你所做的一切表示感激。

　　3. I am thankful / obliged to you for your unselfish assistance during …

　　感謝你在……期間給予我無(wú)私的幫助。

　　4. I deeply appreciate your courtesy and we hope to have the opportunity of rewarding you rendered me.

　　我非常感謝你的好意，并希望有機(jī)會(huì)回報(bào)你。

　　5. I take this opportunity to express my deep appreciation of your kind help you rendered me.

　　我借此機(jī)會(huì)對(duì)你所給予我的幫助表示深深的感謝。

　　6. It was kind and generous of you to do this for me, and I appreciate it more than I can say.

　　你為我這樣做真是太好了，我感激不盡。

　　7. My appreciation to you for your generous help is beyond my words. I wish I could repay it some day.

　　我無(wú)法用語(yǔ)言來(lái)表達(dá)對(duì)你的感激之情。但愿有朝一日能回報(bào)你的幫助。

　　8. Please accept my most cordial thanks for your timely help, which I will never forget.

　　請(qǐng)接受我誠(chéng)摯的謝意，感謝你及時(shí)的幫助，我將難以忘懷。

　　9. Words fail me when I want to express my gratitude to you.

　　感激之情難以言表。

　　10. Again, I would like to express our warm thanks to you.

　　我再次向你表示感謝。