谢谢你。 Thank you.

本句相当于"Thanks."，这两种表达法后面都可以加修饰语，如"Thank you very much."或 "Thanks a lot."等，译为“非常感谢”。

你真好。 It's very nice of you.
较亲密的朋友间也可以用"That's sweet of you."

我非常感激你。 I'm very grateful for you.
grateful a.感激的，感谢的

我欠你个人情。 I owe you one.
I'm in your debt.我欠你情。
owe v.欠，感恩于 debt n.债务，负债，恩义，情义
be in debt 欠债，欠人情

我的确很感激你为我所做的一切。I do appreciate what you have done for me.
appreciate v.感谢，感激

我想表达我的感激之情。 I'd like to express my gratitude.
express v.表达，表示
gratitude n.感激之情，谢意

乐意效劳。 It's a pleasure.
=It's my pleasure. 还可以简化为"My pleasure."或"Pleasure."
pleasure n.荣幸

不用客气。 You are welcome.
Don't mention it. 没什么值得一提的。
mention v.提及，说起

太感谢你了。I really can't thank you enough.
enough ad.足够地，充足地 a.足够的，充足的

没什么麻烦的。 No problem.=No sweat.=No trouble.
It was nothing.没什么。 sweat n.汗水