Цитата:
vladirys:
Sorry, that is not the way you write it:
If must be cold outside, if the water is frozen... ( or "froze up" or
" if the is frost on the grass or the walkway" )
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I'm not sure what you mean...it doesn't make any sense to me.
-mustn't is the reduced form of "must not"; however, it is not shortened very often because it sounds awkward (and like vladirys said, uneducated maybe).