Example sentences of "but it [is] [vb pp] they " in BNC.

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1 The pilots were told to divert towards India but it is believed they turned north by mistake and hit the mountains .
2 Again , not much is known , but it is thought they were probably pets or purely working dogs .
3 String theories also lead to infinities , but it is thought they will all cancel out in versions like the heterotic string ( though this is not yet known for certain ) .
4 The bodies have not yet been identified , but it 's thought they 're Linda Bohlen and Stefan Mohr who 've been missing since the end of September .
5 They 'll be valued soon , but it 's thought they could be worth around ten thousand pounds .
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