Example sentences of "been [verb] for [adj] decades " in BNC.

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1 Interventions by schools to reduce smoking have been undertaken for many decades , although little attention has been given to assessing their effectiveness .
2 A further example is when an organisation which has been trading for many decades finds itself increasingly out of touch with the market and the organisation 's internal culture and style is no longer appropriate to the markets it is trying to address .
3 There was virtually no constituency organisation to cope with a major campaign — it had not been needed for three decades !
4 Replacement of the undilatably strictured lower oesophagus by a short segment of left hemicolon has been practised for several decades .
5 Rift systems have been studied for many decades but have received renewed attention since the early 1970s because of their association with crustal upwarps and their role in continental rupture .
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