Example sentences of "have [been] [vb pp] [prep] [art] period " in BNC.

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1 From the enhanced provision of electronic delivery by the Document Supply Centre to a huge programme for retrospectively converting music , map and manuscript catalogues which have been created over a period of more than one hundred and fifty years , to the question of how to extend the provisions of the Copyright Act 1911 to include legal deposit of digital publications , the Library faces a formidable set of tasks arising from the electronic revolution .
2 A survey of hedgerows by the Institute of Terrestrial Ecology shows that more than 10 per cent of hedgerows have been lost in the period between 1984 and 1990 .
3 Er improvement schemes and measures were identified and have been implemented over a period of time .
4 For determining whether the value and service potential of physical resources have been maintained during a period .
5 The results of Model Developments Ltd have been included for the period 1st April 1990 to the date of disposal of 1st January 1991 .
6 I note that the Opposition 's tax plans have gone back to the drawing board ; after five years of careful preparation , they have been ditched in a period of five weeks .
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