http://www.learnenglish-online.com/grammar/tests/zeroconditional.html
http://www.english-grammar-lessons.com/type0/exercise1.swf
http://www.english-grammar-lessons.com/type0/exercise2.swf
http://www.english-grammar-lessons.com/type0/exercise3.swf
http://www.esl-lounge.com/student/grammar/2g42-what-do-you-do-if.php
http://www.my-english.edu.pl/index.php?id=67
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