| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [adv] over a period of | 31 |
|
| 2 | [vb pp] [adv] over a period of | 16 |
|
| 3 | [adv] [adv] over a period of | 7 |
|
| 4 | [noun] [adv] over a period of | 7 |
|
| 5 | [adv] [verb] over a period of | 8 |
|
| 6 | [adv] [vb pp] over a period of | 8 |
|
| 7 | [adv] [adv] over a period of | 7 |
|
| 8 | [adv] [adv] over a period of | 5 |
|
| 9 | [adv] over a [adj] period of | 12 |
|
| 10 | [adv] over a [adj] period of | 12 |
|
| 11 | [adv] over a long period of | 8 |
|
| 12 | [adv] over a long period of | 8 |
|
| 13 | [adv] over a period of [noun] | 39 |
|
| 14 | [adv] over a period of time | 22 |
|
| 15 | [adv] over a period of [noun sg] | 22 |
|
| 16 | [adv] over a period of time | 22 |
|
| 17 | [adv] over a period of [noun pl] | 17 |
|
| 18 | [adv] over a period of [adj] | 14 |
|
| 19 | [adv] over a period of [num] | 10 |
|
| 20 | [adv] over a period of year | 7 |
|
| 21 | [adv] over a period of years | 7 |
|
| 22 | [adv] over a period of weeks | 5 |
|
| 23 | [adv] over a period of week | 5 |
|
