Uncountable and countable

Countable nouns can be counted, e.g. an apple, two apples, three apples, etc

For positive sentences we can use a/an for singular nouns or some for plurals. There's a man at the door.

I have some friends in New York.

For negatives we can use a/an for singular nouns or any for plurals.

I don't have a dog.

There aren't any seats.

We aleays use a singular verb with uncountable noun Information is valuable

We never use a/an I hate it when it's traffic around

We can use "some" for positive sentences and questions. He gave me some advice

We can use any for negative sentences and questions. There isn't any rice. Did you see any ice in the water?