Enlaces
[1] https://www.dropbox.com/s/10vjgwidx9qqktx/american_music.odp?dl=0
[2] http://www.eslforprimarykids.com/test-your-listening-4-grade.html
[3] http://esl-english.polldaddy.com/s/test-your-listening-3-4-grade
[4] http://www.saberingles.com.ar/curso/lesson01/06.html
[5] http://www.grammar.cl/Games/To_Be_Present.htm
[6] http://www.ejerciciodeingles.com/ejercicios-presente-verbo-to-be-rellenar-huecos/
[7] http://chagall-col.spip.ac-rouen.fr/IMG/didapages/personality/index.html
[8] http://chagall-col.spip.ac-rouen.fr/IMG/didapages/jobs/index.html