Example sentences of "must be [prep] [art] [adj -est] " in BNC.

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1 The whole system usually depends on gravity — which means the cold water storage cistern must be above the highest point of the hot water cylinder ( usually the hot water draw-off ) , and the hot water cylinder must be above the boiler so that the heavier ( cooler ) water falls and the lighter ( heated ) water rises through the various connecting pipes .
2 And the abiding memory of the eighties must be of the greatest achievement , the enormous increase in passenger traffic .
3 video and film must be of the highest professional standard and rigorously edited
4 The honourable calling of a councillor must be of the highest worth for no councillor must lower himself or his calling by obtaining any illegal financial gain from his activities as a councillor .
5 But to the historian it must be of the deepest interest .
6 The puppy must be on the lowest level .
7 The herbs must be in the best possible condition and generously used for a good refreshing taste .
8 The regulation distance that a soakaway must be from the nearest building has increased over the years .
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