Example sentences of "when [verb] upon to do " in BNC.

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1 Such agreements could only be honoured if Britain retained the power to go to their assistance when called upon to do so .
2 For them he is a dark god but a necessary one , for they live in a violent world and must be able to fight when called upon to do so .
3 The war did not prove particularly popular with the English nobility , who served when called upon to do so but gained little from it .
4 He 's been through it all , has ol' Slow Hand — alcoholism and drug addiction , and most recently the tragic death of his only child — but as this record amply demonstrates , he 's still capable of mixing it when called upon to do so .
5 Whilst not expressly stated here , it is reasonable to expect that MAS will monitor the overall progress of the search initiative and , specifically , will provide informal valuations of potential targets when called upon to do so .
6 It is a duty for public officials to advise , when called upon to do so , on policy choices which are ultimately the responsibility of political executives .
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