Example sentences of "been a [adj] source " in BNC.
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| 31 | The advertising of the scheme and the consequent level of public awareness has been a constant source of concern . |
| 32 | While their father accepted that they were both of an age where they wanted to fly the nest , their mother , who , it had to be said , doted on her son — who 'd been a constant source of worry to her — took a little longer . |
| 33 | Ever since it first appeared , the tractor , like the motor car has been a potential source of danger and death . |