PASIVE VOICE

More activities to practise
http://www.english-area.com/paginas/gramatica.htm#inicio
http://www.english-area.com/paginas/passivesentences1.htm
http://www.englisch-hilfen.de/en/exercises/passiv1.htm
http://www.learnenglishfeelgood.com/sp/ingles-voz-pasiva1.html
http://www.learnenglishfeelgood.com/sp/ingles-voz-pasiva2.html

To choose between pasive or active
http://www.ego4u.com/en/cram-up/tests/hadrians-wall
http://www.ego4u.com/en/cram-up/grammar/passive/exercises?simple-present-2
http://www.ego4u.com/en/cram-up/grammar/passive/exercises?simple-past-2