from Wiktionary, Creative Commons Attribution/Share-Alike License
- Cannot have.
Sorry, no etymologies found.
"Yeah ... can't've tied him up properly," said Hagrid, gazing happily out over the grounds.
"Don 'worry, it can't've gone far if it's this badly hurt, an' then we'll be able ter -- GET BEHIND THAT TREE!"
It can't've been that bad otherwise I'd've copied and pasted it like I did with some others which did get moderated.
"it can't've bin him, I'll swear it in front o 'the Ministry o' Magic if I have to -"
'something' is that coicindence is impossible, or, for example, a view that beautiful can't've been created by trial and error ...