| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] over a [adj] period | 52 |
|
| 2 | be [vb pp] over a long period | 22 |
|
| 3 | be [vb pp] [prep] a longer period | 11 |
|
| 4 | be [vb pp] [prep] a longer period | 11 |
|
| 5 | be [vb pp] over a [adj -er] period | 10 |
|
| 6 | be [vb pp] over a longer [noun] | 9 |
|
| 7 | be [vb pp] over a longer [noun sg] | 9 |
|
| 8 | [be] [vb pp] over a longer period | 8 |
|
| 9 | be [vb pp] over a longer period | 8 |
|
| 10 | be [vb pp] over [art] longer period | 8 |
|
| 11 | be [vb pp] over a longer period | 8 |
|
| 12 | be [vb pp] over a longer period | 8 |
|
| 13 | be [vb pp] over [art] longer period | 8 |
|
| 14 | be [verb] over a longer period | 8 |
|
