Conditionals: type 0, 1 and 2

Conditionals are essential in many situations in English.

Read this grammar explanation of their use or follow this presentation  and do the following exercises:

http://www.englishgrammarsecrets.com/type0/menu.php 
http://www.englishgrammarsecrets.com/firstconditional/menu.php 
http://www.englishgrammarsecrets.com/secondconditional/menu.php