how to say thanks !!!!

I really appreciate it.
我很感謝。

You're one in a million.
你真是個大好人。

You're the greatest.
你最棒了。

稱讚對方功勞的"謝謝"：

Thanks to you (we made it on time.)
都要多謝你（我們才能準時完成）。

I couldn't have done it without you.
若是沒有你，我不可能做到。

非常正式的"謝謝"：

I'm truly grateful for your help.
我非常感激你的幫助。

Your help is greatly appreciated.
非常感激您的幫助。

I'd like to express my gratitude.
我要表達我誠摯的謝意。


Expressing thanks  表示感謝

Thank you for your wonderful meal.  
謝謝您的盛情款待。
I really have enjoyed it.
我真的很喜歡。