Example sentences of "[noun pl] when [pron] [is] [adj] [verb] " in BNC.

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1 Crime does not stop at county borders when it is possible to drive through three counties in an hour .
2 This type of data storage is useful for analysis techniques but has limitations when it is necessary to manipulate a number of models simultaneously , as in designing complete assemblies .
3 Aristotle only produces spurious suggestions about a woman 's incapacity to think or to stick to principles when he is obliged to say something about why their judgements lack authority .
4 Difficulties arise with such techniques when it is necessary to choose both the objectives and constraint forms for a design condition that contains a large number of conflicting requirements .
5 Generally the plural and singular of the same noun are regarded as equivalent , but there are a number of instances when it is necessary to treat the plural and the singular forms as distinct .
6 I say " in principle " because , life being what it is , there are many occasions when it is impossible to say whether a story is a pure detection affair or one partaking of more of the crime element .
7 While market forces may undoubtedly bring many positive benefits , both socially and politically , there are many occasions when it is legitimate to subject them to regulation in order to secure confidence and fairness in the operation of the financial markets .
8 So there are occasions when it is important to check the meaning attached to a particular word .
9 There may be rare occasions when it is desirable to emphasise the importance of some decisions by stating specifically that it is the decision of Her Majesty 's Government .
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