Hi Phillip, welcome to the forums! : Underneath is less used than under (simply a shorter version) Basically they're all the same word, under is just a shorter version of underneath (through years of the language changing with use) Under is probably a little more flexible, so safest to use. While beneath is still a great word, it can sound out-of-place is CERTAIN sentences: I'm beneath the bed.
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It's a common mistake, but I still can't understand why people confuse the two.
I also can't understand why Americans confuse "choose" with "chose" and why Britishers refer to Australia as "down under".
But Australia IS down under!
In Australia you'd say Britain "IS down under". "Top and above" or "down under" are relative terms, relative to where (or perhaps, what you think) you are.
To my knowledge, in Britain(in the olden days), convicts and other criminals were sent to rot in the dungeons down under------and