| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] over a [adj] period | 83 |
|
| 2 | [vb pp] over a long period | 44 |
|
| 3 | [vb pp] [prep] a longer period | 14 |
|
| 4 | [vb pp] [prep] a longer period | 14 |
|
| 5 | [vb pp] over a [adj -er] period | 12 |
|
| 6 | [verb] over a longer period | 11 |
|
| 7 | [vb pp] over a longer [noun] | 11 |
|
| 8 | [vb pp] over [art] longer period | 10 |
|
| 9 | [vb pp] over a longer period | 10 |
|
| 10 | [vb pp] over [art] longer period | 10 |
|
| 11 | [vb pp] over a longer period | 10 |
|
