Learn what "why so formally all of a sudden" means, when people say it, and how to use it naturally in English.

It means the speaker notices a sudden change in tone and wants to know why.
From Honey Gold, Episode 20
Someone asks why the other person is suddenly speaking so formally.
Use this when someone starts sounding unusually polite or distant. It can also sound teasing, depending on tone.
Scenes unlock real expressions as you watch
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