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