Example sentences of "[noun sg] [verb] been known for [adj] " in BNC.
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| 1 | The squinch had been known for some time and was used in Persia , Turkestan , Armenia and Asia Minor . |
| 2 | FLARES on the Sun have been known for many years to produce powerful bursts of X-rays , gamma-rays and charged particles . |
| 3 | Variants of this reaction have been known for many years . |
| 4 | Variants of this reaction have been known for many years . |
| 5 | The problems of the system under which the starter operates a lever had been known for some years , but the Jockey Club and the course executive failed to replace it , the report added . |
| 6 | Although the general distribution of earthquakes around the world had been known for many years , it was only with the establishment of a comprehensive network of seismographic stations to monitor underground nuclear weapons testing in the early 1960s that a detailed global picture emerged ( Fig. 2.10 ) . |
| 7 | The latter phenomenon has been known for some time , Zwaardemaker recording several ‘ cancelling pairs ’ as far back as 1875 , which included : |