Complex+sentences+(B1)

http://www.englisch-hilfen.de/en/grammar_list/passiv.htm http://www.englisch-hilfen.de/en/exercises_list/alle_grammar.htm http://www.ego4u.com/en/cram-up/grammar/passive http://www.oup.com/elt/global/products/englishfile/intermediate/a_grammar/file06/nef_int_grammar06_b01/ http://www.oup.com/elt/global/products/englishfile/intermediate/a_grammar/file06/nef_int_grammar06_c02/
 * Passive sentences

http://www.ego4u.com/en/cram-up/grammar/relative-clauses http://www.learnenglishfeelgood.com/esl-relative-clauses1.html http://www.learnenglishfeelgood.com/esl-relative-clauses2.html http://www.learnenglishfeelgood.com/esl-relative-clauses4.html http://www.learnenglishfeelgood.com/esl-relative-clauses3.html http://www.oup.com/elt/global/products/englishfile/intermediate/a_grammar/file06/nef_int_grammar06_c01/ http://www.oup.com/elt/global/products/englishfile/intermediate/a_grammar/file06/nef_int_grammar06_c02/
 * Relative sentences

http://www.englisch-hilfen.de/en/grammar_list/if.htm http://www.ego4u.com/en/cram-up/grammar/conditional-sentences http://www.englisch-hilfen.de/en/exercises_list/alle_grammar.htm http://www.oup.com/elt/global/products/englishfile/intermediate/a_grammar/file04/nef_int_grammar04_01a/ http://www.oup.com/elt/global/products/englishfile/intermediate/a_grammar/file04/nef_int_grammar04_a02/ http://www.oup.com/elt/global/products/englishfile/intermediate/a_grammar/file04/nef_int_grammar04_b02/ http://www.oup.com/elt/global/products/englishfile/intermediate/a_grammar/file04/nef_int_grammar04_b01/ http://www.oup.com/elt/global/products/englishfile/intermediate/a_grammar/file07/nef_int_grammar07_a01/ http://www.oup.com/elt/global/products/englishfile/intermediate/a_grammar/file07/nef_int_grammar07_a02/
 * Conditional sentences