Grammatical Distinction
The concept of a "mass nouns" is a grammatical concept and is not based on the innate nature of the object that the noun refers to. For example, "seven chairs" and "some furniture" could refer to exactly the same objects, with "seven chairs" referring to them as a collection of individual objects but with "some furniture" referring to them as a single undifferentiated unit. However, some abstract phenomena like "fun" and "hope" have properties which make it difficult to refer to them with a count noun.
Classifiers are sometimes used as count nouns preceding mass nouns, in order to redirect the speaker's focus away from the mass nature. For example, "There's some furniture in the room" can be restated, with a change of focus, to "There are some pieces of furniture in the room"; and "let's have some fun" can be refocused as "Let's have a bit of fun".
In English, some nouns are used most frequently as mass nouns, with or without a classifier (as in "Waiter, I'll have some coffee" or "Waiter, I'll have a cup of coffee"), but also less frequently as count nouns (as in "Waiter, we'll have three coffees.")
Read more about this topic: Count Noun
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