一般的说法：
Thanks.
谢谢。
I really appreciate it.
我很感谢。
比较热情的说法：
You're one in a million.
你真是大好人。
You're the greatest.
你最棒了。
要归功于对方的时候：
Thanks to you (we made it on time.)
都要多谢你（我们才能准时完成）。
I couldn't have done it without you.
若是没有你，我不可能做到。
比较正式的说法：
I'm truly grateful for your help.
我非常感激你的帮助。
Your help was greatly appreciated.
你的帮助备受感激。
I'd like to express my gratitude.
我要表达我的谢忱。
 

 不错不错，谢谢楼主，第一、二句其实用的还是比较多的

 蛮实用的~

 LZ, You're one in a million.

 Thanks,LZ.

 You're one in a million.

 LZ,I really appreciate it.

有用，有用

 顶，超实用真强！

 语言应该是多样化的，学习了！

 谢谢楼主，学习了

 You're one in a million.

 Tks, anyway.

 You're one in a million.

 You're one in a million.
 

 记住了，用得多的是第一、二个。