(一).You shouldn't have. 你不必这样。/让你白白受累了。

原音重现：

A: Here is a present for your birthday.

这是给你的生日礼物。

B: Thank you. You really shouldn't have.

谢谢，你完全不必破费。

美剧表达:

Oh, sweetheart, you shouldn't have, it's so beautiful!

噢，亲爱的，你不必这样的，不过它真的很漂亮。

(二).You are (very) welcome. 哪里哪里。/不客气。

原音重现：

A: Thank you for hosting the party.

感谢你举办这次派对。

B: You're very welcome. Come back again.

不客气，下次再来。

美剧表达:

I have some work to do. But you are welcome to stay.

虽然我有事情要忙。但请你随意。