| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [adv] [prep] a long period | 17 |
|
| 2 | [verb] [adv] over a long period | 11 |
|
| 3 | [verb] [adv] [prep] a long period | 11 |
|
| 4 | [verb] [adv prt] [prep] a long period | 10 |
|
| 5 | [vb pp] [adv] [prep] a long period | 9 |
|
| 6 | [verb] [adv] for a long period | 6 |
|
| 7 | [vb past] [adv] [prep] a long period | 6 |
|
| 8 | [verb] on [prep] a long period | 5 |
|
| 9 | [verb] on [prep] a long period | 5 |
|
