Uncountable Noun

An uncountable noun, sometimes called a mass noun is a noun that usually does not have a plural form. Some examples of this kind of noun are:

bread, water, milk, air, snow, accommodation, furniture

Some nouns are usually uncountable, like furniture, accommodation, music and luggage. 
For example, many nouns for food and drink items such as cheese, water, milk, rice, sugar and butter are normally regarded as uncountable nouns. 

Nouns like these however can also be countable, particularly when we think of them as different kinds or varieties of a product.
These days supermarkets sell many different cheeses.
Demarara, muscovado and caster are some of the different sugars we can use when baking.

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Uncountable nouns

What is more important in life: knowledge, money, or happiness?

Can you give me some information about accommodation in the city?

There are three main types of uncountable nouns that students often think are countable:

• activity nouns: travel, work, homework
• information nouns: advice, information, knowledge, research
• group nouns: accommodation, baggage, furniture, money, traffic, weather

Other nouns that are uncountable are:

• liquids and gasses: water, air
• materials and substances: wood, rice
• feelings and ideas: happiness, education
• subjects: geography, history, economics

A few uncountable nouns look plural because they end in -s. But they use a singular verb like other uncountable nouns:

Physics is a very interesting subject.

 

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Uncountable or countable: does it matter?

Yes. Countable and uncountable nouns have different grammar and are used with different words.
Countable nouns can have plural forms. They can be used with the indefinite article.
Uncountable nouns are normally used with singular forms and can't be used with the indefinite article.