Concordância verbal e nominal

http://www.brasilescola.com/gramatica/concordancia-verbal-nominal.htm

http://www.mundovestibular.com.br/articles/5405/1/Concordancia-Verbal/Paacutegina1.html

http://www.mundovestibular.com.br/articles/9565/1/Concordancia-Nominal/Paacutegina1.html