Antonis M. Can I say "a ground, a floor" ...? I think you mean " the ground" — what you walk on outdoors.
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Antonis M. Can I say "a ground, a floor" ...?
I think you mean "the ground" — what you walk on outdoors. That would not be "a ground".
I believe that in the sense you are probably using it, it's also "the floor" — what you walk on indoors.
I dropped my wallet on [the ground / the floor].
Check a dictionary for
Antonis M.or they are not countable?
No. "or aren't they countable?"
Be sure to invert subject and verb in a question.
CJ