http://www.spanish.bz/imperfect.htm
http://www.bellaonline.com/articles/art32108.asp
http://www.spaleon.com/imp.php
http://www.practiquemos.com/ejercicios-en/imperfecto.php
http://conjuguemos.com/home/docs/nologin/spanish_fillin_grammar_12.html
http://conjuguemos.com/home/docs/nologin/spanish_fillin_grammar_29.html
http://college.cengage.com/languages/spanish/renjilian/caminos/3e/chapters/chapter7.html
http://www.trinity.edu/MSTROUD/GRAMMAR/PRET4.HTM
Fill-in.
http://spanish.about.com/library/weekly/aa022299.htm
Fill-in.
http://www.colby.edu/~bknelson/SLC/superhombre.php
Super-Hombre: clik
http://www.colby.edu/~bknelson/SLC/superhombre2.php
Super Hombre y Hombre Araña: clik
http://www.colby.edu/~bknelson/SLC/ricitos1.php
Goldilocks: clik
http://www.colby.edu/~bknelson/SLC/ricitos2.php
Goldilocks: fill-in
http://www.colby.edu/~bknelson/SLC/quemiedopase.php
Un video con práctica buena.
http://www.quia.com/pop/3356.html
http://conjuguemos.com/home/docs/nologin/spanish_fillin_grammar_15.html
