| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [adv] over a period | 12 |
|
| 2 | [noun] [adv] over a period | 9 |
|
| 3 | [adv] [adv] over a period | 5 |
|
| 4 | [adv] [verb] over a period | 8 |
|
| 5 | [adv] [vb pp] over a period | 8 |
|
| 6 | [adv] over a [adj] period | 29 |
|
| 7 | [adv] over a [adj] period | 26 |
|
| 8 | [adv] over a long period | 17 |
|
| 9 | [adv] over a long period | 14 |
|
| 10 | [adv] over a period [prep] | 34 |
|
| 11 | [adv] over a period of | 34 |
|
| 12 | [adv] over a period [prep] | 34 |
|
| 13 | [adv] over a period of | 34 |
|
