ZERO CONDITIONAL

http://www.my-english.edu.pl/index.php?id=67

FIRST CONDITIONAL

http://web2.uvcs.uvic.ca/courses/elc/studyzone/330/grammar/1cond1.htm

SECOND  CONDITIONAL

http://www.focus.olsztyn.pl/en-second-conditionals-exercises.html#.WcrGQ_l97IU