Vídeo com explicação: https://www.youtube.com/watch?v=4f0S2_wJiNM
Link 1: https://learningapps.org/4061243
Link 2: http://www.englisch-hilfen.de/en/exercises/if_clauses/type_2_statements.htm
Link 3: http://www.englishexercises.org/makeagame/viewgame.asp?id=3958
Link 4: http://www.myenglishpages.com/site_php_files/grammar-exercise-conditional-type-2.php
Link 5: http://www.perfect-english-grammar.com/second-conditional-exercise-1.html
Link 6: http://www.learnenglish-online.com/grammar/tests/2ndconditional.html
Link 7: http://www.englishgrammarsecrets.com/secondconditional/menu.php