I’m having some trouble understanding ”a/an”.
In sentences like this one:
”A gunman entered my store and held a gun to my head.”
What is ”a” really telling me as a reader about the gunman and the gun?That it is one, non-specfic, gunman holding one, non-specific, gun to my head? Or is ”a” in this sentence merely expressing the quantity; that it is ”one” gunman holding ”one” gun?