- Exercicios Pasiva: http://www.juntadeandalucia.es/averroes/recursos_informaticos/concurso2005/17/index.html
- PDF exercicios Padre Manjón: http://profeblog.es/blog/teacher/files/2009/03/passive-exercise-unit-6.pdf
- Passive.Self study exercises.http://www.iesdamasoalonso.es/elynx/uploads/archives/Passives-BAC1-PRA-Self-study-Ex.pdf
- Passive grammar exercises:http://www.englisch-hilfen.de/en/exercises_list/passiv.htm
