| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] over a [adj] period | 83 |
|
| 2 | [vb pp] over a [adj] period | 71 |
|
| 3 | [vb pp] [prep] a long period | 53 |
|
| 4 | [vb pp] [prep] a long period | 53 |
|
| 5 | [vb pp] over a long period | 44 |
|
| 6 | [vb pp] over a long [noun] | 36 |
|
| 7 | [verb] over a long period | 35 |
|
| 8 | [vb pp] over [art] long period | 34 |
|
| 9 | [vb pp] over a long period | 34 |
|
| 10 | [vb pp] over a long period | 34 |
|
| 11 | [vb pp] over [art] long period | 34 |
|
