some

I have some English books.

Is that correct or should it be Tengo unos libros de

Hola, G:

In this case UNOS and ALGUNOS work fine. Both express an indefinite quantity of libros.

Salludos,

C.

does it ever make a difference?

Yes it does, I think. Contexually. Hold on...

http://spanish.about.com/od/translationsfromenglish/a/algunos-unos.htm

okay this article explains it. :)

¡Muy bien, chicas! The article explains it well.

Carmen.