| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [vb pp] over [art] [adj] period | 10 |
|
| 2 | [was/were] [verb] over a [adj] period | 9 |
|
| 3 | was [verb] over [art] [adj] period | 6 |
|
