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Warnings
You can use the imperative to warn someone of danger. All the words in the warning are stressed, but the last word has a higher tone than the first word:
For example:
• Sit down now!
* "Sit", "down" and "now" are all stressed, and the tone falls on "now".
• Watch out!
• Look out!
• Don't cross!
Advice
When you give advice using the imperative, the words are stressed normally.
For example:
• Don't tell him you're resigning now! Wait until Monday when he's in a better mood.
• Don't drink alcohol
• Don't eat heavy meals
Requests
You can also use the imperative to make a request, but you should use a polite word before the verb:
For example:
• Please take a seat.
• Please wait here.
• Please hold the line.
• Please don't smoke here.
Notes:
Note that an imperative sentence does not require a subject; the pronoun "you" is implied