How is the Celtic expression "canna" (cannot) properly written, as in, "It canna be done, laddy!!"?

Update: "Engine Room! Scotty, there's a Klingon battlecruiser on our tail! I need Warp 7!" "It cannae be done, Captain! The engines are red hot now! Besides, we're running out of coal!" "Coal?? Scotty, Warp engines run on dilithium crystals!" "Aye! Then you'd better send... show more "Engine Room! Scotty, there's a Klingon battlecruiser on our tail! I need Warp 7!"

"It cannae be done, Captain! The engines are red hot now! Besides, we're running out of coal!"

"Coal?? Scotty, Warp engines run on dilithium crystals!"

"Aye! Then you'd better send someone down with a hose! There's an awful big fire going on down here!"

(Credit to late standup comic Charlie Manna)
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