Exercises

http://www.englishexercises.org/buscador/buscar.asp?nivel=any&age=0&tipo=any&contents=present+simple


http://www.impact-english.com/members/Grammar_Practice/Always/test-grammar/gr_prac_use-PPrg-gen.htm


http://www.englishtenses.com/utest/present_simple_multiple_choice_exercise_2

http://www.1-language.com/englishcourse/unit3_index.htm

http://www.montsemorales.com/grammar.html

http://www.saberingles.com.ar/lists/adverbsfrequency.html

http://www.agendaweb.org/verbs/present_simple-exercises.html

http://www.agendaweb.org/verbs/present_simple-exercises.html