Example sentences of "it become essential " in BNC.

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1 Before phylloxera , it had not been necessary to prune and train , although vine training systems were widely practised — after phylloxera it became essential .
2 It became essential to obtain an accurate estimate of just how many tigers were left .
3 Furthermore , in common with other non-Catholic teachers , they considered that at times when it became essential to redeploy teachers , it would be non-Catholics that would be first in line for re-deployment .
4 But since the districts were not subservient to the counties , the concept of ‘ delegation ’ was inappropriate , and thus it became essential for there to be clear guidelines to distinguish county issues from district issues .
5 It becomes essential to vectorial movement through any uniform fluid .
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