Example sentences of "[vb pp] [prep] a long period [prep] " in BNC.
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| 31 | Such factors may include , for instance , a previous experience of loss which was dealt with badly , unresolved grief , past experience of failure , a lack of a sense of self-efficacy , a low self-esteem , a previous history of psychiatric disorder , and an absence of close relationships established over a long period of time . |
| 32 | All your behaviour , with the exception of those reflexes that were built into the system , has been acquired over a long period of ad hoc learning . |