Example sentences of "must be [adj] [adv] to be " in BNC.

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1 To be clinically useful , observations must be simple enough to be made by multiple carers on a psychiatric ward ; excessive simplicity , however , may undermine their value .
2 It must be simple enough to be used efficiently by non planning professionals , but detailed enough to produce meaningful results .
3 Any drawing must be large enough to be clearly seen and also set the standard for items produced by the learner .
4 Sentences with subjects having definite referents , such as ( 80 ) , assert the definite referent 's having performed the infinitival event based on the fact that perception of this event took place , and , as stated above , this means that the definite referent 's having performed this action must be significant enough to be stated as a fact ( known through the perceptual event having taken place ) .
5 ‘ Monsieur Verveine must be old enough to be her father !
6 He thought , eating it , that he must be careful not to be too metaphorical in his instructions , since , in her anxiety to obey him to the letter , she might feed him a diet of unrelieved soup and rice pudding .
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