half a/a half/a half a

Gabriel Malheiros

Senior Member
Portuguese - Brazil
Hi, there

I was watching a TV show and a guy said:

"I got a half a can of beer left in this open container"

Why are there "two articles A "? Why not just "half a can"? Is there any difference between "half a" "a half" and "a half a"?

Thank you
 
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