| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] over a period of | 59 |
|
| 2 | [v-ing] over a [noun] of | 52 |
|
| 3 | [v-ing] over a [noun sg] of | 49 |
|
| 4 | [v-ing] over a period [prep] | 13 |
|
| 5 | [v-ing] over a period [prep] | 13 |
|
| 6 | [v-ing] over [art] period of | 12 |
|
| 7 | [v-ing] over [art] period of | 12 |
|
| 8 | [v-ing] over a period of | 12 |
|
| 9 | [v-ing] over a period of | 12 |
|
| 10 | [v-ing] over a period of | 12 |
|
| 11 | [v-ing] over a period of | 12 |
|
| 12 | [v-ing] [adv prt] a period of | 12 |
|
| 13 | [v-ing] [adv] a period of | 12 |
|
