ejercicio desde escritorio

https://docs.google.com/document/edit?id=13F_lDlmTQIxL9eBMfWO70zlpc46k2St_JLYP14PokD8&hl=es

exercises simple past tense

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

exercises simple past tense

http://www.perfect-english-grammar.com/past-simple-exercise-7.html

simple past tense

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

exercises simple past tense

http://www.bradleys-english-school.com/online/jigword/jigpast1.html

simple past tense

http://esl.about.com/library/beginner/blwhatdid.htm

simple past tense

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

simple past tense

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

simple past tense

http://esl.about.com/od/beginningenglish/ig/Basic-English/Past-Simple.htm

SIMPLE PAST TENSE

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

simple past tense

english Exercise: what can.

http://www.englishexercises.org/makeagame/viewgame.asp?id=1172#a

VERB CAN GRAMMAR EXAMPLES

VERB "

verb can pronunciaciòn

VERB "CAN"...PRONUNCIATION

verbo can poder

EL VERBO "CAN"..."PODER"