Here I am again to ask you about the definition of Countable/Uncountable nouns that we see in dictionaries.

For example: Apple (C/U), but it doesn't mention when it's Count. or Uncountable.

Other example was with Pear (C/U).

Food (C/U)

How do I know? Can I use both of them?

Thank you.


*PS: Two cups of coffee = two coffees???
Three bottles of beer = two beers???