'kushat''

[Frank J. Miller]

A simple explanation and easy rule  to follow is given in the slightly
dated "Trudnosti russkogo jazyka - spravochnik zhurnalista" M. 1981, ed. L.
Rachmanovoj:

V otlichie ot slova "est'" slova "kushat'" v literaturnoj rechi
upotrebljaetsja ogranichenno: ono ispol'zuetsja v forme infinitiva
(kushat'), povelitel'novo naklonenija (kushaj, kushajte) pri vezhlivom
priglashenii k ede, pri obrashchenii s voprosom o zelanii est', po
otnosheniju k detjam, a takzhe v rechi detej.

V otlichie ot slova "est" slovo "kushat'" nel'zja upotrebljat' po
otnosheniju k zhivotnym.

Skazannoe otnositsja takzhe k upotrebleniju slov "dokushat', nakushat'sja"
i dr.

*************************************************************************
Frank J. Miller                                  fjm6 at columbia.edu
Professor of Russian                                    Fax: 212-854-5009
Columbia University                                     Phone: 212-854-3941
New York, NY 10027
*************************************************************************

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