
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/1cond1.htm
http://www.englishgrammarsecrets.com/firstconditional/exercise1.html
http://www.englishgrammarsecrets.com/firstconditional/exercise2.html
http://www.englishgrammarsecrets.com/firstconditional/exercise3.html
http://www.englishgrammarsecrets.com/firstconditional/exercise4.html
http://perso.wanadoo.es/autoenglish/gr.con1.p.htm
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