| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | were [verb] [prep] a [noun] [prep] | 1160 |
|
| 2 | [be] [verb] [prep] a period [prep] | 170 |
|
| 3 | be [verb] [prep] a period [prep] | 170 |
|
| 4 | [was/were] [verb] [prep] a period [prep] | 51 |
|
| 5 | were [verb] [prep] [art] period [prep] | 21 |
|
| 6 | were [verb] [prep] [art] period [prep] | 21 |
|
| 7 | were [verb] [prep] a period [prep] | 13 |
|
