| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [verb] [adv] [prep] [art] period | 9 |
|
| 2 | [was/were] [vb pp] [adv] [prep] [art] period | 9 |
|
| 3 | was [verb] [adv] [prep] [art] period | 7 |
|
| 4 | [was/were] [verb] [adv] [prep] a period | 6 |
|
