熱情洋溢的“謝謝”：

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。

稱贊對方功勞的“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。