| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] over long period | 5 |
|
| 2 | [be] [vb pp] over long period | 5 |
|
| 3 | [vb pp] over [art] long period | 34 |
|
| 4 | [vb pp] over a long period | 34 |
|
| 5 | [vb pp] over a long period | 34 |
|
| 6 | [vb pp] over [art] long period | 34 |
|
