| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] were [verb] [prep] a period | 9 |
|
| 2 | [noun pl] were [verb] [prep] a period | 6 |
|
| 3 | were [verb] [prep] a [adj] period | 9 |
|
| 4 | were [verb] [prep] a [adj] period | 9 |
|
| 5 | were [verb] [prep] a period [prep] | 13 |
|
| 6 | were [verb] [prep] a period of | 13 |
|
| 7 | were [verb] [prep] a period of | 13 |
|
| 8 | were [verb] [prep] a period [prep] | 13 |
|
