class 7: if-clauses type 0 and type 1

type 1:
http://www.englisch-hilfen.de/uebungen/if_saetze/typ_1_mix.htm
http://www.ego4u.de/de/cram-up/grammar/conditional-sentences/type-1/exercises
http://www.ego4u.de/de/cram-up/grammar/conditional-sentences/type-1/exercises?02
http://www.english-grammar-lessons.com/firstconditional/exercise1.swf
http://www.impact-english.com/members/Grammar_Practice/Always/test-grammar/gr_prac_form-Cond1.htm
http://www.english-grammar-lessons.com/firstconditional/exercise2.swf
http://www.englisch-hilfen.de/en/exercises/if_clauses/mix.htm

type 0:
http://www.englishexercises.org/makeagame/viewgame.asp?id=8732
http://www.englishgrammarsecrets.com/type0/exercise1.swf
http://www.englishgrammarsecrets.com/type0/exercise2.swf
http://web2.uvcs.uvic.ca/courses/elc/studyzone/330/grammar/0cond1.htm
http://www.learnenglish-online.com/grammar/tests/zeroconditional.html