http://www.better-english.com/grammar/condit22.htm
http://web2.uvcs.uvic.ca/elc/studyzone/410/grammar/2cond1.htm
http://www.learnenglishfeelgood.com/grammar-secondconditional2.html
https://www.ego4u.com/en/cram-up/grammar/conditional-sentences/type-2/exercises?02
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