Thank you so much.
非常感謝

Thanks a lot.
多謝

I can't thank you enough for this.
感激不盡

I don't know how I can thank you.
真不知道怎么感謝你。

I really appreciate this.
真的太感謝你了。


Dialogue1:
A: Thanks. That was really nice of you.
太感謝了，你真是太好了。

B: No problem, happy to help.
沒什么，很高興能幫到你。

Dialogue2:
A: Thanks a lot.
多謝。

B: You're welcome, I'm glad you like it.
不客氣，很開心你能喜歡。

Dialogue3:
A: I don't know how I can thank you for this.
我真的不知道我該如何謝謝你。

B: That's ok. Don't mention it.
沒什么的，不必再提。

Dialogue4:
A: I really appreciate this.
我真的很感謝。

B: It's nothing.
沒什么的。


Conversation:
A: I really want to thank you for all of your help.
真是太感謝你提供的幫助了。

B: It was nothing, really. I'm sure you would have done the same for me.
沒什么了，真的，我想你也會為我這么做的。

A: Still, you took a lot of time out of your day to help me with this presentation. You didn't have to do that.
你花了那么長時間，幫我準備這份報告，你本不必這么做的。

B: Yeah, but when I first started here, you went out of your way to make me feel welcome. I really appreciate that.
是的，但是我剛來的時候你竭盡全力讓我感到很有歸屬感，對此我真的非常感謝。
go out of one's way表示“竭盡全力”

A: Well, I'm glad we could help each other out.
我很高興，我們可以相互幫忙。