english 4....conditionals 0 and 1

http://www.slideshare.net/cdnosfe/conditionals-0-1-and-2

http://www.englishgrammarsecrets.com/type0/menu.php

http://www.perfect-english-grammar.com/first-conditional-exercise-1.html

 http://elt.oup.com/student/solutions1stedition/preint_unit_page/unit6/grammar/exercise2?cc=us&selLanguage=en

http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/0cond1.htm