2. Some / any

Some - positive sentences (algún, alguna, algunos, algunas)

I have got some cheese in the fridge.
There are some boys in the classroom.

Any - negative sentences (ningún, ninguna, ningunos, ningunas)
interrogative sentences (algún, alguna, algunos, algunas)

Have you got any rice in the cupboard?
I haven't got any chocolate in the cupboard.
Are there any tables in the clasroom?
No, there aren't any tables in the classroom.