Exercises for all.

http://www.educa.madrid.org/web/eoi.pinto.pinto/html/ingles_grammar.html http://www.english-grammar-lessons.com/presentsimpleorcontinuous/exercise3.html 


http://www.autoenglish.org/freeexercises.htm 


http://www.englishpage.com/ http://www.english-4u.de/grammar1.htm 

http://www.miguelmllop.com/practice/intermediate/grammar/indextogrammar.htm