| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [vb pp] [prep] a long period | 5 |
|
| 2 | was [vb pp] [prep] a long period | 5 |
|
| 3 | [was/were] [vb pp] [prep] a long period | 5 |
|
