Example sentences of "[coord] it [be] often necessary [verb] " in BNC.

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1 Machine detergents : Comparative costing is a little more difficult as two or more chemicals are involved , such as detergent and rinse additive , and it is often necessary to compare powders with liquids .
2 Many aspects of the site , including dating , are revealed by its finds , and it is often necessary to compare finds with those discovered elsewhere .
3 Of course , this is a very simple case , and it is often necessary to consider many more AOs and MOs .
4 The term ‘ rich ’ implies that the pictures should contain a wealth of information relevant to the study ; however , trying to include too much detail can result in them becoming extremely cluttered , and it is often necessary to summarise the detail ( using the interview analysis technique if required ) and redraw them as the study progresses .
5 Other income came from the calves we had to spare and everyone would lose quite a bit of sleep when the cows were calving since the event would invariably happen in the middle of the night and it was often necessary to play midwife in case of complications .
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