1.I really appreciate it.
我很感谢。

2.You're one in a million.
你真是个大好人。

3.You're the greatest.
你最棒了。

4.Thanks to you(we made it on time.)
都要多谢你(我们才能准时完成)。

5.I couldn't have done it without you.
若是没有你，我不可能做到。

6.I'm truly grateful for your help.
我非常感激你的帮助。

7.Your help is greatly appreciated.
非常感激您的帮助。

8.I'd like to express my gratitude to your help.
感谢您的帮助。