Example sentences of "[vb base] for long periods " 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 . |