Example sentences of "[conj] [noun pl] [be] known to [be] " in BNC.

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1 River insects develop wings in the last stage of their life cycle , and dragonflies are known to be able to fly many miles .
2 If patients were known to be moving away a letter detailing their surveillance history was sent to their doctor or next supervising consultant .
3 Because viruses are known to be implicated in the development of certain cancers , it was natural to investigate any possible relationship between herpes infection of the cervix and cervical cancer .
4 This could in turn explain why a higher proportion of experimental eggs were rejected at Santa Fe than at Guadix , because hosts are known to be more likely to reject alien eggs when they are alerted by encounters with the adult parasite in the vicinity of their nest .
5 As yet , no definitive decision has been made as to the microkernel that will be used for new versions of OS/2 , though developers are known to be working with the Carnegie-Mellon University 's Mach 3 microkernel ; in addition , there is the possibility that IBM might use the NT kernel — ‘ we could use the NT microkernel if we wanted to ’ , it said .
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