LINKS DE EJERCICIOS DE TIEMPO PASADO EN INGLES

Exercise on positive sentences

http://www.ego4u.com/en/cram-up/grammar/simple-past/exercises?04

Erxercise on questions

http://www.ego4u.com/en/cram-up/grammar/simple-past/exercises?06

Exercise on negative sentences

http://www.ego4u.com/en/cram-up/grammar/simple-past/exercises?05

http://www.perfect-english-grammar.com/past-simple-exercise-8.html

http://www.inglesmundial.com/I5/grammar.htm