Example sentences of "[noun pl] [verb] been used [verb] [det] " in BNC.
Next page| No | Sentence |
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| 1 | Elsewhere in this book , empirical evidence for commodity futures has been used to supplement that for index futures . |
| 2 | Several methods have been used to detect this response , including agglutination , complement fixation , and enzyme linked immunosorbent assay ( ELISA ) . |
| 3 | Methods have been used to overcome these problems to some degree . |
| 4 | The gases have been used to cool most types of fridges for decades but are now headed for a world-wide ban in 1996 after being blamed for causing holes in the ozone layer , which shields the earth from the sun 's harmful ultraviolet rays . |
| 5 | Only 30 per cent of the usual resources had been used to achieve this , and the entire harvest had been sold , he said . |
| 6 | A range of techniques has been used to avoid this problem , including chromatographic cellulose fibre powder to remove PCR inhibitors from the samples . |
| 7 | Several spectroscopic techniques have been used to examine this effect for CO adsorption on single-crystal metal surfaces , but bond energy changes can only be inferred indirectly from these techniques . |
| 8 | Increasingly sophisticated techniques have been used to solve these problems . |
| 9 | A number of approaches have been used to achieve this definition . |