Б253
как ни в ЧЁМ не бывало делать что, вести себя и т. п.
collAdvPInvaradv or sent
advfixed WO (to do sth. , behave) in a manner suggesting that one has not been affected by the preceding or concurrent events (which would be expected to elicit some reaction)
as if (though) nothing (had) happened (were happening)
as if (though) nothing were wrong(in limited contexts) as if one had never seen
heard etc)
as if
though) it were the most natural thing in the world
just as one used to do.