Example sentences of "[vb pp] [adv] a [adj] period " in BNC.

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1 Together with radiometric age determinations of the most recent eruptive episode , such reconstructions enable estimates to be made of the amount of material eroded over a known period of time .
2 One of the most important limitations on statutory safeguards is the insistence that , to qualify for most rights , you must have built up a specified period of continuous employment .
3 Most people discharged from hospital psychiatric care have had only a short period as in patients and do not need long-term help after leaving .
4 The Government has advised that women who are pregnant or may become pregnant should not eat liver , as very large doses of vitamin A taken over a long period may be associated with foetal abnormalities .
5 Unfortunately it may conceivably cause liver disease if taken over a long period , and this is to be tested by administering it to pigs .
6 In such studies records of a very large number of events are taken over a considerable period of time and memory for the events is subsequently tested .
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