| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] over a period | 46 |
|
| 2 | [be] [vb pp] over a period | 46 |
|
| 3 | [be] [vb pp] over a period | 16 |
|
| 4 | be [vb pp] over a period | 16 |
|
| 5 | [was/were] [vb pp] over a period | 15 |
|
| 6 | was [vb pp] over a period | 11 |
|
| 7 | [noun] [vb pp] over a period | 9 |
|
| 8 | [adv] [vb pp] over a period | 8 |
|
| 9 | [verb] [vb pp] over a period | 8 |
|
| 10 | [adv] [vb pp] over a period | 8 |
|
| 11 | have [vb pp] over a period | 7 |
|
| 12 | [noun pl] [vb pp] over a period | 7 |
|
| 13 | is [vb pp] over a period | 6 |
|
| 14 | [is] [vb pp] over a period | 6 |
|
| 15 | [vb pp] [adv] over a period | 19 |
|
| 16 | [vb pp] [adv prt] over a period | 14 |
|
| 17 | [vb pp] up over a period | 5 |
|
| 18 | [vb pp] up over a period | 5 |
|
| 19 | [vb pp] over a [adj] period | 83 |
|
| 20 | [vb pp] over a [adj] period | 71 |
|
| 21 | [vb pp] over a long period | 44 |
|
| 22 | [vb pp] over a long period | 34 |
|
| 23 | [vb pp] over a [adj -er] period | 12 |
|
| 24 | [vb pp] over a longer period | 10 |
|
| 25 | [vb pp] over a three-year period | 5 |
|
| 26 | [vb pp] over a three-year period | 5 |
|
| 27 | [vb pp] over a period [prep] | 71 |
|
| 28 | [vb pp] over a period [prep] | 71 |
|
| 29 | [vb pp] over a period of | 70 |
|
| 30 | [vb pp] over a period of | 70 |
|
