Example sentences of "they do [not/n't] become [adj] " in BNC.

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1 Official milestones were authorised on the London to Chester road in 1744 , but they did not become compulsory until 1773 .
2 However , care should be taken that they do not lose their exceptional hardiness and thriftiness in pursuit of greater yields , and also that they do not become extinct through being crossed with Friesians .
3 The long punters will have plenty of sport with that one though there could be considerable confusion at a quick kick where the revised law says that it may be taken without waiting for the kicker 's team to retire behind the ball — provided they do not become involved in play .
4 I call them Billies regardless of sex , using an amiable tone of voice since it is important they do not become involved in or suffer any hostility of any sort .
5 Insert sausage-shaped rolls of acid-free tissue paper in folds , so that they do not become permanent — caused , as a microscope would show , by fibres cracking .
6 Canids and felids also date from this time ( Savage , 1965 ) , but like hyaenids they do not become common until the middle Miocene .
7 Care should be taken with punishers to ensure that they do not become rewarding .
8 The spores of various fungi are nearly always present in woodwork , just as the germs of many diseases are present in our bodies , but they do not become active unless the conditions are favourable .
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