Grammar Review online exercises

Do the following exercises to review for the exam:


http://www.nonstopenglish.com/exercise.asp?exid=910  (much/many/a little/a few)
http://www.perfect-english-grammar.com/present-perfect-exercise-4.html
http://www.perfect-english-grammar.com/past-simple-exercise-3.html
http://www.perfect-english-grammar.com/past-simple-exercise-7.html
http://www.perfect-english-grammar.com/past-simple-present-perfect-1.html

http://www.perfect-english-grammar.com/past-simple-past-continuous-exercise-1.html

http://learnenglish.britishcouncil.org/en/grammar-exercises/present-perfect 
http://learnenglish.britishcouncil.org/en/grammar-exercises/past-continuous-and-past-simple
http://www.perfect-english-grammar.com/time-prepositions-exercise-1.html
http://www.usingenglish.com/quizzes/45.html (comparatives and superlatives)


Explicación en español:

Contables e Incontables
Pasado simple verbo "to be"
Pasado simple
Pasado continuo
Presente perfecto