我写这封信是为了感谢你在学习上对我的帮助。

I am writing to express my sincere gratitude for your help in my study.

youdao

为了感谢你上周在工作上对我的帮助。

To thank you for helping me at work last week.

youdao

我写信是为了感谢你对我在美国期间的帮助。

I'm writing to thank you for your help during my stay in America.

youdao

我写信是为了感谢你对我在美国期间的帮助。

I'm writing to thank you for your help during my stay in America.

youdao