jueves, 18 de abril de 2013

Do, does, don't, doesn't

Haz estos ejercicios para repasar cómo utilizar el verbo auxiliar "do"
First exercise:
http://www.daypo.com/test-verbo-auxiliar-do.html
Second exercise:
http://www.englisch-hilfen.de/en/exercises/tenses/do_does2.htm
Third exercise:
http://www.members.iinet.net.au/~adelegc/grammar/present_simple/pres_sim_quests1.html
Fourth exercise:
http://www.theyellowpencil.com/topresent1.htm

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