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Hadde ikkje fasanen skrike opp, hadde han ikkje blitt skoten.

Had the pheasant not screamed it would not have been shot. [So keep quiet and refrain from unwise remarks.]

Han veit ikkje ein gong om potetene er kokte eller ikkje.

He doesn't even know whether the potatoes are boiled or not. [He lacks common sense. About someone who is not aware of what is taking place under his very nose.]