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