our main discussion is about write coution with imperative sentence. there are many example of caution and we can find it in everywhere, like in school or zoo. I will talking about caution in school zona.

fist, I will explain about what is imperative sentence?

is a verb that use to command,request,warning,advise. Imperative usually uses to warning, like caution.

 
the example of imperative sentences :

1. clear the blackboard tomorrow !
2. please open the door !
3. don't be late for the school !