You can use the imperative to give direct commands, instructions, or advice. For instance, your teacher may tell you to “sit down” or “be quiet” or “open your book” or “raise your hand”. These are all examples of the imperative.
So, what are you waiting for? Go practice!
www.youtube.com/watch?v=sJbWW2kbRhM
www.englishgrammarsecrets.com/imperative/menu.php
http://esl.about.com/od/beginningenglish/ig/Basic-English/Imperative.htm
My ESL Help 