Example sentences of "have been [vb pp] [adv prt] since [adj] " in BNC.
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| 1 | The Electrochemical Technology business has been built up since 1981 to capitalize on ICI 's expertise in chlor-alkali production and electrochemistry. the FM21 membrane cell has been sold since that year , mainly as part of a chlor-alkali production package , but recent developments have led to its use in the manufacture of more complex speciality or ‘ effect ’ chemicals . |
| 2 | It has been built up since 1975 by combining Fiat 's original truck division in Italy with foreign acquisitions : Unic in France , Magirus in Germany , Pegaso in Spain and Iveco Ford in the UK ( in which Fiat has a 48% stake , but controls operations ) . |
| 3 | Although the 20 cm square shaft has been known about since 1882 it is only with developments in recent technology that it has been possible to explore it by means of a video camera mounted onto a mini robot . |
| 4 | Although the pied flycatcher 's adultery has been known about since 1950 , it is only in the last few years that the scientist Rauno Alatalo and his colleagues , studying pied flycatchers in Sweden , have begun to unravel the finer details . |
| 5 | Considerable research has been carried out since 1973 by the Department of Geology at Cardiff University . |
| 6 | Some US$570 million in military aid to Pakistan had been cut off since 1990 under US legislation requiring such a cut-off unless the President certified to Congress that Pakistan was not developing nuclear weapons [ see p. 37764 ] . |
| 7 | Diplomatic relations between the UK and Libya had been broken off since that year . |
| 8 | No executions had been carried out since 1984 , and there were currently 287 people in prison waiting for parliament to confirm or commute their death sentences ( mostly handed down in the early 1980s ) . |
| 9 | On Aug. 29 Nazarbayev closed the nuclear testing site at Semipalatinsk where over 500 nuclear explosions had been carried out since 1949 . |
| 10 | These represent in most instances the crofts or separate paddocks of half an acre to an acre in size which have been hedged around since medieval times . |
| 11 | Advertising has been banned in Iceland since 1971 ; surveys of 12–16 year olds in Reykjavik ( where 40% of the entire age- group live ) have been carried out since 1974 and show a very clear trend . |