| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [verb] over a period [prep] | 41 |
|
| 2 | [be] [verb] over a period [prep] | 41 |
|
| 3 | was [verb] [prep] a period [prep] | 38 |
|
| 4 | was [verb] over a [noun] [prep] | 23 |
|
| 5 | was [verb] over a [noun sg] [prep] | 21 |
|
| 6 | [was/were] [verb] over a period [prep] | 15 |
|
| 7 | was [verb] over a period [prep] | 11 |
|
| 8 | was [verb] over a period [prep] | 11 |
|
| 9 | was [verb] over a period [prep] | 11 |
|
| 10 | was [verb] over [art] period [prep] | 11 |
|
| 11 | was [verb] over [art] period [prep] | 11 |
|
