| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] over a period [prep] time | 22 |
|
| 2 | [adv] over a period [prep] time | 22 |
|
| 3 | [adv] over a period of time | 22 |
|
| 4 | [adv] over a period of time | 22 |
|
| 5 | [adv prt] over a period [prep] time | 12 |
|
| 6 | [adv] over a period [prep] time | 9 |
|
| 7 | up over a period [prep] time | 5 |
|
| 8 | up over a period [prep] time | 5 |
|
