7º Ano - Indefinite Articles

http://www.englishexercises.org/makeagame/viewgame.asp?id=1203

http://www.grammarbank.com/indefinite-articles.html

http://www.myenglishpages.com/site_php_files/grammar-exercise-articles.php#.VD_m9mddWvM

6º ano B - Verb TO BE in the Past

http://www.ego4u.com/en/cram-up/grammar/simple-past/exercises?03

http://www.englishexercises.org/makeagame/viewgame.asp?id=929

http://suz.digitaleschulebayern.de/english/grammar/was_were1.htm

http://www.montsemorales.com/gramatica/Pastsimplebe.htm

http://www.eflnet.com/grammar/tobepast.php#.VDsgKGddWvM

http://www.englishexercises.org/makeagame/viewgame.asp?id=5133

http://www.carmenlu.com/first/grammar/pastbe1_1.htm

http://testy.mzs-vb.cz/spustit-test.php?id=348

http://www.isabelperez.com/was-were-2.htm

http://first-english.org/english_learning/english_tenses/simple_past/01_simple_past_tense_exercise.htm