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

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1 For theft there must be adverse interference or usurpation .
2 We argue therefore , now as in our sixth report , that among the critical requirements in an INSET programme are the following : the diversity of teachers ' needs must be acknowledged and addressed ; teachers themselves must be central to the process of defining their needs ; and to meet diverse needs there must be diverse INSET programmes : not just as to their content and level , but also in their style and venue .
3 If disinfection is carried out using a disinfectant there must be sufficient time for the chemical to take effect , namely the contact time , plus a small safety margin after which surfaces must be dried .
4 To get motorists to switch modes there must be financial incentives , such as a big environmental tax on petrol , the revenue from which goes to improve public transport .
5 Carolyn Douglas points out , however , that if teenagers are involved in destructive friendships there must be underlying reasons .
6 Because of the inhomogeneity of the interstellar medium there must be wide variations in the actual mean n e across an arm along the line of sight to specific pulsars .
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