countable and uncountable nouns

Let's read
http://www.shertonenglish.com/resources/es/nouns/nouns-uncountable.php

http://www.inglesmundial.com/Ingles_Intermedio_Leccion7/Ingles_Intermedio_Leccion7_Gramatica.html
http://www.aprenderinglesfacil.es/2008/06/sustantivos-contables-e-incontables.html

http://my.opera.com/StManor/blog/how-much-how-many-contables-e-incon

Let's practice
http://learnenglishteens.britishcouncil.org/grammar-vocabulary/grammar-snacks/countable-and-uncountable-nouns