| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [vb pp] over a [adj] period | 52 |
|
| 2 | be [vb pp] over a [adj] period | 52 |
|
| 3 | been [vb pp] over a [adj] [noun] | 19 |
|
| 4 | been [vb pp] [prep] a [adj] period | 18 |
|
| 5 | been [vb pp] [prep] a [adj] period | 18 |
|
| 6 | been [vb pp] over a [adj] [noun sg] | 17 |
|
| 7 | been [vb pp] over [art] [adj] period | 8 |
|
| 8 | been [verb] over a [adj] period | 8 |
|
| 9 | been [vb pp] over a [adj] period | 8 |
|
| 10 | been [vb pp] over [art] [adj] period | 8 |
|
| 11 | [been] [vb pp] over a [adj] period | 8 |
|
| 12 | been [vb pp] over a [adj] period | 8 |
|
| 13 | been [vb pp] over a [adj] period | 8 |
|
