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The imperative mood has a variety of functions.
HOW fallacious it is to judge of the nature of things by the ordinary and inconstant use of words appeareth in nothing more than in the confusion of counsels and commands, arising from the imperative manner of speaking in them both, and in many other occasions besides. For the words do this are the words not only of him that commandeth; but also of him that giveth counsel; and of him that exhorteth; and yet there are but few that see not that these are very different things; or that cannot distinguish between when they when they perceive who it is that speaketh, and to whom the speech is directed, and upon what occasion. …
Hobbes, Lev XXV 1