Example sentences of "[noun] has [verb] over [art] period " in BNC.

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1 My belief is that our good practice has evolved over a period of more than 50 years and that it has developed in classrooms through the dedicated expertise of British teachers enjoying the relative freedom traditionally allowed within our education system .
2 Answer guide : To provide a guide to the way in which a business has performed over a period of time .
3 The figures below show how credit use has changed over the period covered by these three surveys .
4 In the case of the urban riots , it is the nature of the television coverage which is in essence inciting other young people in different parts of the country to civil disobedience , whereas in the case of football violence , the implication is that the perceived lack of moral leadership by the broadcasting corporations has led over a period of years to a general moral climate in this country which fails to provide adequate controls over the behaviour of the nation 's youth .
5 CHESAPEAKE BAY Has created over a period of about 17000 years .
6 Its share of total industrial activity has varied over the period but the figures for the late 1960s are representative .
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