Example sentences of "have been known for [adj] [noun] " in BNC.
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| 31 | As members will be aware , the Local Government Regions and Districts have been known for some time , and the areas of the Sheriffdoms were published at the beginning of the year . |
| 32 | It 's been known for some time that dioxins are created when chlorine is used to make paper white , but in many situations it 's been difficult to find substitutes . |