| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [adv] [prep] a long period | 11 |
|
| 2 | [verb] [adv] [prep] [art] long period | 9 |
|
| 3 | [verb] [adv] over [art] long period | 7 |
|
| 4 | [vb pp] [adv] [prep] [art] long period | 6 |
|
