Example sentences of "for [noun sg] must be [adj] " in BNC.

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1 As each new period 2 " tR bursts into oscillation , the effective free spectral range of the cavity is halved , because the generalised condition for resonance must be constructive interference after 2 " round trips , since only after 2 " tR do the cavity 's optical properties repeat themselves .
2 Fittings used for restraint must be adequate and secure .
3 He displayed perfectly that contradiction of attitude ( or ‘ supreme paradox ’ , as Phillipson puts it ) in ‘ expert ’ thinking on old age that had emerged by the 1940s — on the one hand portraying the elderly as a disastrous burden on society ( men over the age of 65 and women ova 60 had formed 6.2 per cent of the British population in 1901 , an estimated 12.0 per cent in 1941 , and would be 20.8 per cent in 1971 ) , yet on the other hand , paying lip-service to their status as an exceptionally deserving group : ‘ Provision made for age must be satisfactory ; otherwise great numbers may suffer .
4 The newer , smaller , spontaneous groups — of parents with mentally handicapped children , for example must be voluntary and self-help to retain their independence and to enable them to build the self-respect of their members .
5 It is a serious lacuna in socialist thought to imagine that the virtues of ‘ planning for social need ’ are self-evident , that the only grounds for doubt must be vested interest in the workings of the ‘ free market ’ .
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