http://www.learnenglishfeelgood.com/grammar-secondconditional2.html
https://www.ego4u.com/en/cram-up/grammar/conditional-sentences/type-2/exercises?02
http://www.englishexercises.org/makeagame/viewgame.asp?id=3227
http://www.learnenglish-online.com/grammar/tests/2ndconditional.html
http://web2.uvcs.uvic.ca/elc/studyzone/410/grammar/2cond2.htm
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