For Ludmila

http://www.englishpractice.com/grammar/noun-clause-exercise/ http://depts.dyc.edu/learningcenter/owl/clauses.htm http://depts.dyc.edu/learningcenter/owl/exercises/clauses_ex1.htm http://depts.dyc.edu/learningcenter/owl/exercises/conjunctions_ex2.htm http://www.englishexercises.org/makeagame/viewgame.asp?id=2368 http://www.learn4good.com/languages/evrd_grammar/adverb_clauses_ex.htm http://esl.about.com/od/grammaradvanced/a/adverb_clauses.htm http://www.ego4u.com/en/cram-up/grammar/relative-clauses