LingualNet - Aprender Inglés a través de los medios de comunicación

Lingual Net provides interesting movies, with subtitles, scripts, and quizzes, to help you practice English listening. We have a variety of videos: music, comedy, animation, documentary, drama, and YouTube selections.

http://lingual.net/?lang=es

Non-defining relative clauses - quizzes

http://www.better-english.com/grammar/nondef.htm

http://www.autoenglish.org/gr.nonrelat.i.htm

http://www.bbc.co.uk/apps/ifl/worldservice/quiznet/quizengine?ContentType=text/html;quiz=146_clauses