Example sentences of "have [been] an essential [noun sg] " in BNC.

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1 Such is the latest outcome of forty years of enthusiastic and single-minded agriculture , of which an equally enthusiastic drainage policy has been an essential part , that conservationists are now questioning the aims of intensive river management on its own terms of hard-headed economics and efficiency .
2 This participation is demonstrated in several articles , including ‘ Combating inequality ’ on page 11 , which describes how the involvement of local communities in community mapping in the West Bank and Gaza Strip has been an essential part of the process .
3 Religion is the ‘ universal obsessional neurosis of humanity ’ which has been an essential stage for humanity to pass through , in the same way as every child must have a neurotic phase .
4 Offa 's victory over Cynewulf in 779 , therefore , would seem to have been a signal for intensified Mercian activity on Offa 's southern border which may have been an essential prerequisite to any sustained involvement in the south-east .
5 This implied the eventual disbanding of the rural ‘ communes ’ which had been an essential part of Mao s agricultural policy .
6 However , without exception , all the women had to make some economies because their wages had been an essential part of the household economy and their benefits were too low to compensate for their lost earnings .
7 This threat held serious consequences for the government of Prime Minister Kiichi Miyazawa , as support from the Takeshita faction had been an essential ingredient in his election to the leadership of the party , and was generally seen as essential to his continued survival in the post .
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