| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [vb pp] for a [adj] period | 11 |
|
| 2 | [was/were] [verb] for a [adj] period | 11 |
|
| 3 | was [verb] for a [adj] period | 11 |
|
| 4 | [was/were] [verb] for a [adj] period | 10 |
|
