| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [adv prt] over a period of | 19 |
|
| 2 | [vb pp] [adv prt] over a period of | 12 |
|
| 3 | [adv prt] over a period of [noun] | 20 |
|
| 4 | [adv prt] over a period of time | 12 |
|
| 5 | [adv prt] over a period of [noun sg] | 12 |
|
| 6 | [adv prt] over a period of time | 12 |
|
| 7 | [adv prt] over a period of [noun pl] | 8 |
|
