PRESENTE SIMPLE PARA PRIMARIA


http://www.englishexercises.org/makeagame/viewgame.asp?id=714

http://www.englishexercises.org/makeagame/viewgame.asp?id=1052

http://www.english-4u.de/present_ex1.htm

http://www.englishexercises.org/makeagame/viewgame.asp?id=3010

http://www.vitutor.com/gramatica_inglesa/verb_tense/present_perfect_ej6.html

Negativa e interrogativa:
http://www.1-language.com/englishcourse/unit4_grammar_exs.htm

http://www.1-language.com/englishcourse/unit4_grammar_exs2.htm

http://www.englishclub.com/grammar/verb-tenses_present_quiz.htm