To request another to open a window by saying “It’s warm in here” is to perform the request politely because one did not use the most efficient means possible for performing this act (i.e., “Open the window”). To perform an act other than in the most clear and efficient manner possible is to implicate some degree of politeness on the part of the speaker. "What exactly is politeness? In one sense, all politeness can be viewed as deviation from maximally efficient communication as violations (in some sense) of Grice’s (1975) conversational maxims.
Conventional grammar takes little account of such strategies, even though we are all masters of both making and understanding the signs that point to what is going on beneath the surface." It is there to soften the demand, giving an impersonal reason for the request, and avoiding the brutally direct by the taking of trouble.
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"'Shut up!' is rude, even ruder than 'Keep quiet!' In the polite version, ' Do you think you would mind keep ing quiet: this is, after all, a library, and other people are trying to concentrate,' everything in italics is extra.