Example sentences of "[vb base] for long period " in BNC.

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1 I have found that the pupils designated as having moderate learning difficulties that I have worked with can : concentrate for long periods of time ; sustain protracted investigations ; be systematic ; reason logically ; find patterns and relationships ; make and test predictions ; generalise ; record and explain their findings .
2 Movements often stop for long periods , but you may be asked to fill in a ‘ kick chart ’ if you are concerned about it .
3 All need annual pruning but many flower for long periods and come in lots of colours .
4 Older people who have fewer than eight main meals each week , or who go for long periods of the day without food , are considered to be especially at risk .
5 A shorter half-life of lymphocytes expressing the lower- M r isoforms has also been observed in sheep , whereas cells with a ‘ naive ’ phenotype persist for long periods in mice after adoptive transfer .
6 Although evolution decrees that species of plant and animal which survive for long periods are shaped to the advantages determined by natural selection , progress over time to larger size might be a law of nature independent of environmental factors .
7 While other constitutional texts , where they existed at all , have for long periods been purely notional , national autonomy never ceased to have a certain operation reality .
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