GRAMMAR to be & present simple

Here, you have some web-sides to practice grammar:

http://http//www.mansioningles.com/gram39_ej1.htm to practice present simple

http://club.telepolis.com/englishweb/thirdpcolour.html to practice the third person of singular (present simple)

http://pagina.jccm.es/edu/cra/sanisidro/cuadernia/ToBeOverview/index.html this is a grate side to learn the verb to be

Good luck!