An imperative sentence makes a command, request, or suggestion - the understood subject is "you", as in "you should" or "you must." They may or may not end in an exclamation point. Example: "Shut the door."

Hi Mohsen: Jakir has given a good explanation. I might add that as commands, imperatives appear from time to time in public communication and private communication. Unkind statements are one example that we are all familar with, as follows: (a) "Shut up!" (b) "Go away!" (c) "Go stuff yourself!" Imperatives can also be offered in a more useful, or utilitarian context, as when someone directs us to perform an action which is necessary, as follows: (d) "Clean up the mess!" (e) "Collate and staple these papers." (f) "Build it this way and do not make any changes." (g) "Get home before 11:00 PM." As you can see, imperatives are often, very brief, and very tersely worded statements. It isn't often that Imperatives are written to contain extensive amounts of directives or commands. ================= Let's look at some sentences which are merely statements, which unlike Imperatives, are called "Declaratives". They declare a fact about something. Example: (h) "Earth Day is celebrated during the Spring Equinox. (i) "Albert Einstein published his Theories of General and Special Relativity in the early part of the 20th Century." (k) The Scientific Theory of Natural Selection is critical to our scientific understanding. (l) The sky is Cloudy. Those are not Imperatives. They are more like simple statements which convey information. Imperatives, convey powerful emotion, They do much more than show or convey normative information. ---Warm Regards, Bruce

"Ask someone else." (Ahhh, just joking.) ;)