Example sentences of "it have [be] shown to [be] " in BNC.

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1 Cannabis Teenagers often insist that cannabis is harmless , but it has been shown to be a high risk for certain users .
2 It has been shown to be virtually impossible to give reliability figures for software when the reliability requirements are less than 1 error in 10 4 .
3 It has been shown to be the most abundant neuropeptide in the central nervous system and is also widely distributed throughout the peripheral nervous system .
4 of Distillers MG explains how it has been shown to be more cost-effective compared to the use of dry ice slices .
5 Today we might say that it had been shown to be different from itself .
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