Example sentences of "perform [prep] a time " in BNC.
Next page| No | Sentence |
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| 1 | Design services will also be performed on a time and materials basis by STB engineering consultants . |
| 2 | Design services will also be performed on a time and materials basis by Sparc Technology engineering consultants . |
| 3 | However , in order to be used successfully , pointing must be carefully co-ordinated with the child 's vocalisations and her direction of gaze and be performed at a time when the adult is attending to the child ( Lock 1980a ) . |
| 4 | Only one type of operation may be performed at a time . |
| 5 | For each package , the user can either ACCEPT or REJECT the SSR , however only one type of operation can be performed at a time . |