We use this expression to say thank you for something and say that maybe the other person has been too generous.
You can use this phrase in ………… language.
Spoken
Written
Informal
Example 1
A: Hey, everyone, I’ve bought champagne. There is enough for everybody.
B: Thanks Michal. Really you shouldn’t have.
A: Don’t mention it.
Example 2
A: Simon, I’m speechless. This is a real diamond ring.
B: Well I wanted to get something you’d like and …
A: I do. It’s perfect. But really, you shouldn’t have.
