| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [vb pp] for a [adj] period | 11 |
|
| 2 | was [vb pp] for a [adj] period | 10 |
|
| 3 | [was/were] [vb pp] for a [adj] period | 9 |
|
