Conditionals

I
http://www.shertonenglish.com/resources/es/conditionals/type1.php

http://www.perfect-english-grammar.com/first-conditional-exercise-1.html

II
http://www.shertonenglish.com/resources/es/conditionals/type2.php
http://www.perfect-english-grammar.com/second-conditional-exercise-1.html

III
http://www.shertonenglish.com/resources/es/conditionals/type3.php
http://www.perfect-english-grammar.com/third-conditional-exercise-1.html

Summary
http://www.perfect-english-grammar.com/support-files/all_conditionals_form_mixed_exercise.pdf