Countability
Uncountable nouns
Uncountable nouns are for example: gold, music, blood, excitement
They have no plural.
You cannot say "musics", "bloods", or "excitements".
Before uncountable nouns you can say the / some / any / much / this / his, etc.:
the music, some gold, much excitement, his blood
But you cannot use a / an before an uncountable noun.
So you cannot say "a music", "an excitement", or "a blood".
You can also use uncountable nouns alone, with no article:
This ring is made of gold.
Blood is red.
Many nouns can be used as countable or as uncountable nouns.
Usually there is a difference in meaning.
For example:
paper
I bought a paper. (a newspaper – countable)
I bought some paper. (material for writing on – uncountable)
hair
There's a hair in my soup! (one single hair – countable)
She has beautiful hair. (hair on her head – uncountable)
experience
We had many interesting experiences on our vacation. (things that happened to us – countable)
You need experience for this job. (knowledge of something because you have done it before – uncountable)
Some nouns are usually uncountable in English but often countable in other languages. Here are the most important of these:
Advice, bread, information, permission, traffic, weather, baggage, chaos, luggage, progress, travel, work, behavior, furniture, news, scenery, trouble
Notice these pairs of countable and uncountable nouns:
I'm looking for a job. – Countable but I'm looking for work. – Uncountable
What a beautiful view. – Countable but What beautiful scenery! – Uncountable
Countable nouns
Countable nouns are things we can count. We can make them plural:
two dogs, six jobs, some girls, many suggestions
Before singular countable nouns you can use a / an:
That's a good suggestion.
Do you need an umbrella?
You cannot use singular countable nouns alone (without a / the / my, etc.):
I'm looking for a job. (not I'm looking for job)
Be careful of the dog. (not Be careful of dog)
I've got a headache.
Would you like a cigarette?
We also use some with plural countable nouns. Some = a number of / a few of (but we don't know or say exactly how many):
I've seen some good movies lately.
Some friends of mine are coming to stay for the weekend.
Do not use some when you are talking about things in general:
I love bananas. (not some bananas)
Sometimes you can use some or leave it out:
There are (some) eggs in the refrigerator if you're hungry.
You have to use some when you mean some, but not all /not many, etc.
Some children learn very quickly. (but not all children)
Some police officers in Britain carry guns, but most of them don't.