我很感谢你在……时的帮助

Thank you very much for the gift you sent me. It is one of the most wonderful gifts I got on my birthday.

非常感谢你寄给我的礼物。那是我生日那天收到最美妙的礼物之一。

Thanks to your effort, we had our most successful---.

感谢你的努力,我们有我们最成功的……。

Please accept my sincere thanks for your help, which I will never forget.

请接受我真诚的感谢，我将永远不会忘记你的帮助。

Again, I would like to express my warm thanks to you.

我想再次表达我对你衷心的感谢。