Relative clauses batxillerat

 http://www.englisch-hilfen.de/en/exercises/pronouns/relative_pronouns.htm
http://www.eoilangreo.net/cristina/pre-intermediate/relatives8.htmhttp://www.ego4u.com/en/cram-up/grammar/relative-clauses/exercises?07
http://www.xtec.cat/~ogodoy/sac/rephrasing/relclex1.htm

http://www.slideshare.net/anagarciapedregosa/relative-clauses-11452482
http://www.perfect-english-grammar.com/relative-clauses.html