1) I am writing to convey my gratitude to you for...
2) I would like to take the opportunity to express my appreciation for your timely help and assistance.
我想利用这个机会因为你的及时帮助表达我的感激之情。
3) Many thanks for all the things you have done in helping us to...
4) Words fail to convey my gratitude to you.
5) My true gratitude is beyond any words/description.
6) On behalf of...I would like to extend my sincere gratitude to you for...
7) I really don’t know how to express my gratitude for your help.
8) With deepest gratitude, I write to you here a few lines.
9) What you did gave us a deep impression and we hope to express our thanks to you.
你所做的给我们留下了深刻的印象,我希望向你表达我们的感谢。
10) I am writing to express my thanks to you for.... If it had not been for your help, I would have
我写信时因为你的帮助而感谢你。如果没有你的帮助,我就会...
11) Thanks to your generous/ selfless/ kind help, without which I wouldn’t have
made such great progress.
感谢你慷慨/无私的帮助,没有你的帮助我就不会取得如此大的进步。
12) It was your generous help that enabled me to have a better understanding of...