Countable Nouns Vs Uncountable Nouns

Countable nouns are easy to recognize. They are things that we can count. For example: "pen". We can count pens. We can have one, two, three or more pens. Here are some more countable nouns:
dog, cat, animal, man, person
bottle, box, litre
coin, note, dollar
cup, plate, fork
table, chair, suitcase, bagCountable nouns can be singular or plural:
My dog is playing.
My dogs are hungry.
We can use the indefinite article a/an with countable nouns:
A dog is an animal.
Uncountable nouns are substances, concepts etc that we cannot divide into separate elements. We cannot "count" them. For example, we cannot count "milk". We can count "bottles of milk" or "litres of milk", but we cannot count "milk" itself. Here are some more uncountable nouns:
music, art, love, happiness
advice, information, news
furniture, luggage
rice, sugar, butter, water
electricity, gas, power
money, currencyWe usually treat uncountable nouns as singular. We use a singular verb. For example:
This news is very important.
Your luggage looks heavy.We do not usually use the indefinite article a/an with uncountable nouns. We cannot say "an information" or "a music". But we can say a something of:
a piece of news.
a bottle of water.
a grain of rice.