Example sentences of "they must be [vb pp] at " in BNC.

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1 These are only a few of the choices before them , but even these are very difficult to prioritize and at times some of them must be sacrificed at the expense of others in this play .
2 The whole question of an adequate income in retirement can be achieved , and changes necessary to enable them must be worked at .
3 Nuclear weapons must be kept up to date , and they must be serviced at intervals ; if that is not done , they become ineffective .
4 They must be blessed at midday on January 24 or they will have no more value than toys .
5 Moreover , if the goals of breadth and balance are to be achieved in the classroom they must be pursued at every other level of the system as well .
6 ‘ The rules are not going to change overnight , but they must be looked at — I think they 're silly .
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