Interesting sites- 7 ª grade

Do you like surfing on the internet? Visit these sites and improve your English through online exercises:
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/irpast2.htm

http://www.englishlab.net/hp/quiz14_past_simple_6_affirmative_negative.htm

http://usuarios.lycos.es/englishweb/gramatica/PastSimAffRegIrregPDC.htm