| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [vb pp] over a long period | 22 |
|
| 2 | [be] [vb pp] over a [adj] period | 21 |
|
| 3 | [be] [vb pp] [prep] a long period | 14 |
|
| 4 | [be] [vb pp] [prep] a long period | 14 |
|
| 5 | [be] [vb pp] over a long [noun] | 11 |
|
| 6 | [be] [verb] over a long period | 10 |
|
| 7 | [be] [vb pp] over a long period | 10 |
|
| 8 | [be] [vb pp] over [art] long period | 10 |
|
