What does a imperative mark look like?

There is no single "imperative mark" in the way that there is a question mark (?) or exclamation point (!). However, the most common way to mark an imperative sentence is by using a period (.) at the end.

Here's why:

* Imperative sentences are commands or requests. They tell someone to do something.

* Periods are typically used to mark the end of declarative sentences. A declarative sentence simply states a fact.

* The use of a period at the end of an imperative sentence emphasizes the command or request. It signals that the sentence is complete and the action is expected to be taken.

For example:

* Close the door. (imperative sentence with a period)

* Please be quiet. (imperative sentence with a period)

While there are other ways to express a command or request, such as using an exclamation point or question mark, the period is the most common and natural way to end an imperative sentence.