Example sentences of "this [was/were] find to [be] " in BNC.

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1 The sandstone was quarried here at first , but later mined when this was found to be more economical than removing the ‘ overburden ’ — the rock and soil which has to be dug away in quarrying to get at the useful strata .
2 This was found to be a general feature of elastomers because of the presence in most polymers of water soluble impurities .
3 The chemical which supplies the colouring is dihydroscyanthraquinone , also called alizarin ; this was found to be a derivative of the hydrocarbon anthracene , from coal-tar .
4 The early mortality for elected admissions was point four percent and this was found to be significantly lower than the early mortality rate for emergency admissions which was two point four percent , some six times higher .
5 ( It used to be at more frequent intervals , but this was found to be too disruptive . )
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