Notice: a) The following forms express annoyance and irritation.
— Do try to work on your own.
— Just speak up a little!
b) You can make your commands sound more polite by using either a low rising tone or words, phrases and structures like "please; I'm afraid; I think; perhaps; don't you think; I (don't) want you to...; I (don't) expect you to...; would you like; would you, please; ..., will you; ..., could you; what if...; let's/let's not."
