Second-person singular simple present subjunctive of be.(verb)
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Use "beest" in a sentence
"How beest thou on this summer day, with thy eyes sparkling like brackish moat water?"
"A pixie told me that thou beest my uncle, locked in a toad's body by the late King Nosch."
"In "Orphan's Tales", the brave princes are often stupid, pretty princesses turn out to be half-monsters and your friend in need is the ugliest, most savage beest in the whole forest."