...There was imperative need to beconstantly alert; for these dogs and men were not town dogs and men... 
Jack London 「The Call of the Wild」
...They regarded the cessation of news as ominous in the extreme, and dispatched imperative orders to the frontier for the maintenance of the utmost vigilance, night and day...
Harry Collingwood 「The Adventures of Dick Maitland」
... in the imperative mood:...
William T. Hornaday 「Our Vanishing Wild Life」
...I do not, therefore, object to it; but I know it is not imperative, and itis well to be convinced on such a point...
Dinks, Mayhew, and Hutchinson 「The Dog」
...The most extraordinary obstacles are powerless to turn it aside fromits plane and its curve, so imperative is its guiding force...
Jean Henri Fabre Alexander Teixeira de Mattos 「The Glow-Worm and Other Beetles」
...So an imperative necessity presents itself: there must perforce be an initial larva form, capable of moving and organized for searching, a form under which the grub would attain its end...
J. Henri Fabre Alexander Teixeira de Mattos 「The Life of the Fly」
... Another and no less imperative reason compels this change of abode on the parasite's part...
J. Henri Fabre 「Bramble-bees and Others」
...The phenomenon that it is most imperative to recognise in this connection isthe inheritance of functional variations...
Ernst Haeckel 「The Evolution of Man」
...When used before the imperative of the verb indi, to give, na becomes ne...
Robert W. Williamson 「The Mafulu」
...The present is found in the indicative and imperative modes,the past in the indicative only, and the future in the indicative and subjunctive...
Robert W. Williamson 「The Mafulu」
...Both are regular except in the imperative, which has respectively ela and elau, ange and angau...
Robert W. Williamson 「The Mafulu」
...We should have remained in the tent, but theshortage of food made it imperative that we keep moving...
Various 「Astounding Stories, April, 1931」
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