
I’ll be darned!
Informal Surprise
Use 'I'll be darned!' in casual settings to show you're taken aback or caught off guard.

I'll be darned, I didn't expect you to be here!
Not for Essays
Avoid in formal writing or speeches; it's too casual and might seem unprofessional.

I'll be darned is something you wouldn't find in a business report.
Emotional Color
Conveys mild emotion; it's not as strong as shouting or as bland as stating a fact.

You fixed it already? I'll be darned!
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