Example sentences of "[is] not [verb] they [vb mod] [verb] " in BNC.

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1 Molecule for molecule , they are 10,000 times more potent than carbon dioxide and it has been estimated that if production is not checked they will rival carbon dioxide as the main greenhouse gas in the twenty-first century .
2 Even if he is not working they will want er I think it 's two pounds twenty a week out of him .
3 Because of the long lead time that would be required to bring such supplies on stream ( not only in opening the quarries but also in preparing suitable dock facilities ) it is not envisaged they will make a major contribution until the second ten years covered by MPG6 .
4 Because of the long lead time that would be required to bring such supplies on stream ( not only in opening the quarries but also in preparing suitable dock facilities ) it is not envisaged they will make a major contribution until the second ten years covered by MPG6 .
5 Whilst a through understanding of AI is not required they should have a little background since all are likely to meet it at one time or another .
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