Example sentences of "must not be [adj] [verb] " in BNC.

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1 it must not be possible to modify archived material ; system users may not have access to archive material but may read copies of it provided by the system manager
2 To be a suitable physical means of exchange , money must be light enough to carry around , must come in a number of denominations , large and small , and must not be easy to forge ( see Box 16.3 ) .
3 Despite slow growth , the Federal Reserve must not be afraid to raise interest rates if inflation continues to increase
4 Fish must not be able to get trapped .
5 However , one further condition must be fulfilled , namely that the upward speed of convective motions must not be sufficient to bear the droplet aloft .
6 Before the provision can apply , an individual ordinarily resident in the United Kingdom must receive a benefit and that individual must not be liable to tax under s739 .
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