| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [adv] over a [adj] period | 12 |
|
| 2 | [verb] [adv] over a [adj] period | 10 |
|
| 3 | [verb] [adv] over a long period | 7 |
|
| 4 | [verb] [adv] over a long period | 5 |
|
| 5 | [verb] [adv] over a period [prep] | 11 |
|
| 6 | [verb] [adv] over a period of | 11 |
|
| 7 | [verb] [adv] over a period [prep] | 11 |
|
| 8 | [verb] [adv] over a period of | 11 |
|
