1. http://web2.uvcs.uvic.ca/courses/elc/studyzone/330/grammar/pcontnq1.htm
2. http://web2.uvcs.uvic.ca/courses/elc/studyzone/330/grammar/pcontnq2.htm
3. http://web2.uvcs.uvic.ca/courses/elc/studyzone/330/grammar/pcont1.htm
4. http://www.ego4u.com/en/cram-up/grammar/present-progressive/form/exercises
5. http://www.ego4u.com/en/cram-up/grammar/present-progressive/form/exercises?form03
quarta-feira, 16 de setembro de 2009
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