http://uczniowie.lo-zywiec.pl/~ang/cottage/files/other_grammar_points/CONDITIONAl_TYPE_I.pdf
http://uczniowie.lo-zywiec.pl/~ang/cottage/files/other_grammar_points/CONDITIONAL_TYPE_II.pdf
http://www.unrestrictedarea.com/esl/First%20Conditional.pdf
Source: http://www.eslflow.com/conditionalsrealunrealsituations.html
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