Sentences used to express orders, requests, suggestions, warnings and prohibitions are called imperative sentences.
form
①: verb prototype+others
②: please+verb prototype+others.
③:Don' t/never+ verb prototype
Example:
Go wash your hands. Go and wash your hands. -command)
Be quiet,please. Please be quiet. -Request)
Don't forget me! Don't forget me!
No parking. (No parking. -Prohibited)