| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [adv] over a period | 34 |
|
| 2 | [vb pp] [adv] over a period | 19 |
|
| 3 | [noun] [adv] over a period | 11 |
|
| 4 | [adv] [adv] over a period | 7 |
|
| 5 | [conj] [adv] over a period | 5 |
|
| 6 | built [adv] over a period | 5 |
|
| 7 | build [adv] over a period | 5 |
|
| 8 | [coord] [adv] over a period | 5 |
|
| 9 | [noun sg] [adv] over a period | 5 |
|
| 10 | [noun pl] [adv] over a period | 5 |
|
| 11 | [adv] [vb pp] over a period | 8 |
|
| 12 | [adv] [verb] over a period | 8 |
|
| 13 | [adv] [adv] over a period | 7 |
|
| 14 | [adv] [adv] over a period | 5 |
|
| 15 | [adv] over a [adj] period | 43 |
|
| 16 | [adv] over a [adj] period | 39 |
|
| 17 | [adv] over a long period | 22 |
|
| 18 | [adv] over a long period | 18 |
|
| 19 | [adv] over a period [prep] | 60 |
|
| 20 | [adv] over a period of | 60 |
|
| 21 | [adv] over a period [prep] | 60 |
|
| 22 | [adv] over a period of | 60 |
|
