Imperative sentences are sentences that give commands or make requests. They typically start with a verb and are often directed at the listener or reader.
Exclamation marks are used to convey strong emotion, emphasis, or surprise.
Example:
* Close the door! (Imperative sentence with exclamation mark)
In this example, the sentence is a command to close the door. The exclamation mark adds emphasis and urgency to the command.
Other examples:
* Help me!
* Be quiet!
* Don't forget your keys!
Therefore, it is perfectly acceptable for an imperative sentence to have an exclamation mark.