Countable nouns can be "counted", they have a singular and plural form .
- A book, two books, three books .....
- An apple, two apples, three apples ....
We use a/an or a number in front of countable nouns.
a / an = 1 - an apple = one apple = 1 apple
An apple a day keeps the doctor away. I eat an apple every day.
We add (s) to show that there is more than l of something.
2 apples a day must be even better.
When there is only one thing we call it singular. When there is more than one thing we say plural.
There is a computer in the room.
There is an elephant in the room.
Have you got a smartphone?
Computers are fun.
Elephants can't jump.
Have you got 2 smartphones?
You can use some and any with plural countable nouns.
Some dogs can be dangerous.
Are there any elephants in your house?
We didn't buy any computers last year.
You can use many / few and a few with plural countable nouns.
Many animals are hunted for their fur.
There are few elephants in England.
There are a few hunters in England.
You can use a lot of and no with plural countable nouns.
No computers were bought last year.
A lot of computers were reported broken the week before.