| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] over a [adj] period | 52 |
|
| 2 | be [vb pp] over a [adj] period | 42 |
|
| 3 | be [vb pp] [prep] a long period | 23 |
|
| 4 | be [vb pp] [prep] a long period | 23 |
|
| 5 | be [vb pp] over a long period | 22 |
|
| 6 | be [vb pp] over a long [noun] | 16 |
|
| 7 | be [vb pp] over a long [noun sg] | 16 |
|
| 8 | be [vb pp] over [art] long period | 14 |
|
| 9 | [be] [vb pp] over a long period | 14 |
|
| 10 | be [vb pp] over a long period | 14 |
|
| 11 | be [vb pp] over a long period | 14 |
|
| 12 | be [vb pp] over [art] long period | 14 |
|
| 13 | be [vb pp] over a long period | 14 |
|
| 14 | be [verb] over a long period | 14 |
|
