I have heard of all of the following conjugations as being imperative forms in Japanese by various texts.

なさる → なさい

くださる → ください

いらっしゃる → いらっしゃいませ

Are these all part of the same category of imperative forms? If so, are these irregular conjugations and/or are they distinct from the 「止まれ」-style imperative?


They are irregular conjugations. Copying from Wikipedia:


There is a sound shift to using い for both the 連用形 (masu-form) as well for the imperative form. As Wikipedia mentions, using the "correct" form sounds very old fashioned.

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