imperative sentence

A sentence that gives advice or instructions or that expresses a request or command. (Compare with sentences that make a statement, ask a question, or express an exclamation.) An imperative sentence ends with a period or an exclamation point.

Examples:  

·         "All hope abandon, ye who enter here!"
(Dante Alighieri, The Divine Comedy)

·         "Think Small"
(slogan of Volkswagen)

·         "Do not on any account attempt to write on both sides of the paper at once."
(W. C. Sellar and R. J. Yeatman, 1066 and All That. Methuen, 1930)

·         "Always do right. This will gratify some people and astonish the rest."(Mark Twain)

·         "Seek simplicity, and distrust it."
(Alfred North Whitehead)

·         "Leave the gun. [pause] Take the cannolis."(Clemenza in The Godfather, 1972)

·         "Bring me the head of Alfredo Garcia!"
(El Jefe, Bring Me the Head of Alfredo Garcia, 1974)

·         "Don't cry because it's over. Smile because it happened."
(Theodor Geisel)

·         "Take this quarter, go downtown, and have a rat gnaw that thing off your face!"
(John Candy as Buck Russell in Uncle Buck, 1989)

·         "We're going in the attic now, folks. Keep your accessories with you at all times."(Buzz Lightyear, Toy Story 3, 2010)

Reference

http://grammar.about.com/od/il/g/impersent09.htm