Example sentences of "but when an [noun sg] " in BNC.

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1 The ingredients of some pesticides have been found not to be injurious to fish , but when an otter consumes a large amount of fish which have absorbed those chemicals , then the otter can become affected and may die or become sterile .
2 But when an idea or the picture is false , we are more conscious of it as a separate thing , for we can clearly see it as a preconception or a prejudice .
3 Econometrics appears to help in determining budgets , and in the deployment of media expenditure — but when an econometrician tells me I should adopt a ‘ drip ’ pattern on TV rather than a ‘ burst ’ pattern ( see page 115 ) , I want to know why .
4 It 's easy to criticize but when an audience grows to this size , there is the responsibility of allowing as many fans as possible to see the shows .
5 Many children are quite happy to run , push , pull , ride and climb , but when an adult is standing by , ready to help , she is sure to be drawn in by the children as in the following example .
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