| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [verb] [prep] a [adj] period | 37 |
|
| 2 | [was/were] [verb] [prep] a [adj] period | 34 |
|
| 3 | [was/were] [vb pp] [prep] a [adj] period | 33 |
|
| 4 | was [verb] [prep] a [adj] period | 29 |
|
| 5 | [was/were] [verb] for a [adj] period | 12 |
|
| 6 | [was/were] [verb] over a [adj] period | 10 |
|
| 7 | were [verb] [prep] a [adj] period | 9 |
|
| 8 | [was/were] [verb] [prep] a long period | 6 |
|
| 9 | [was/were] [verb] [prep] a long period | 6 |
|
| 10 | [was/were] [verb] by a [adj] period | 5 |
|
