| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] over a period [prep] | 41 |
|
| 2 | be [vb pp] over a period [prep] | 41 |
|
| 3 | be [vb pp] over a period of | 40 |
|
| 4 | be [vb pp] over a period of | 40 |
|
| 5 | [noun] be [vb pp] over a period | 18 |
|
| 6 | [noun sg] be [vb pp] over a period | 13 |
|
| 7 | to be [vb pp] over a period | 8 |
|
| 8 | to be [vb pp] over a period | 8 |
|
| 9 | [prep] be [vb pp] over a period | 8 |
|
| 10 | [prep] be [vb pp] over a period | 8 |
|
| 11 | [vb mod] be [vb pp] over a period | 7 |
|
| 12 | [modal v] be [vb pp] over a period | 7 |
|
| 13 | [verb] be [vb pp] over a period | 5 |
|
| 14 | be [adv] [vb pp] over a period | 6 |
|
| 15 | be [adv] [vb pp] over a period | 6 |
|
| 16 | be [vb pp] [adv] over a period | 12 |
|
| 17 | be [vb pp] [adv prt] over a period | 10 |
|
| 18 | be [vb pp] up over a period | 5 |
|
| 19 | be [vb pp] up over a period | 5 |
|
| 20 | be [vb pp] over a [adj] period | 52 |
|
| 21 | be [vb pp] over a [adj] period | 42 |
|
| 22 | be [vb pp] over a long period | 22 |
|
| 23 | be [vb pp] over a long period | 14 |
|
| 24 | be [vb pp] over a [adj -er] period | 10 |
|
| 25 | be [vb pp] over a longer period | 8 |
|
| 26 | be [vb pp] over a three-year period | 5 |
|
| 27 | be [vb pp] over a three-year period | 5 |
|
