Have you got any tomatoes?

There are some exercise books on the floor.

Did you get the ketchup? No, they didn't have any.

You should eat a/some fresh fruit. ( fruit может быть и единственным числом и множественным, поэтому можно использовать, соответственно, a/some )

We had to wait for some minutes.

Is there any lemonade left?

They didn't sing any songs.

Here are some cornflakes, but there isn't milk.

I'm looking for some good music.

There is no butter in the friedge. Let's go and get some.