| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] [adv] over a long period | 7 |
|
| 2 | [vb pp] [adv] over a long period | 5 |
|
| 3 | [be] [vb pp] over a long period | 22 |
|
| 4 | be [vb pp] over a long period | 22 |
|
| 5 | [verb] [vb pp] over a long period | 12 |
|
| 6 | have [vb pp] over a long period | 12 |
|
| 7 | be [vb pp] over a long period | 10 |
|
| 8 | [be] [vb pp] over a long period | 10 |
|
| 9 | [vb -s] [vb pp] over a long period | 5 |
|
| 10 | [been] [vb pp] over a long period | 5 |
|
| 11 | has [vb pp] over a long period | 5 |
|
| 12 | been [vb pp] over a long period | 5 |
|
| 13 | [vb pp] over a long period [prep] | 16 |
|
| 14 | [vb pp] over a long period [prep] | 16 |
|
| 15 | [vb pp] over a long period of | 14 |
|
| 16 | [vb pp] over a long period of | 14 |
|
| 17 | [vb pp] over a long period and | 6 |
|
| 18 | [vb pp] over a long period [conj] | 6 |
|
| 19 | [vb pp] over a long period and | 6 |
|
| 20 | [vb pp] over a long period [coord] | 6 |
|
