| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [adv] [vb pp] [prep] a period | 18 |
|
| 2 | be [adv] [vb pp] [prep] a period | 18 |
|
| 3 | be [adv] [vb pp] over a [noun sg] | 14 |
|
| 4 | be [adv] [vb pp] over a [noun] | 14 |
|
| 5 | be [adv] [verb] over a period | 6 |
|
| 6 | be [adv] [vb pp] over a period | 6 |
|
| 7 | be [adv] [vb pp] over a period | 6 |
|
| 8 | [be] [adv] [vb pp] over a period | 6 |
|
| 9 | be [adv] [vb pp] over a period | 6 |
|
| 10 | be [adv] [vb pp] over a period | 6 |
|
| 11 | be [adv] [vb pp] over [art] period | 6 |
|
| 12 | be [adv] [vb pp] over [art] period | 6 |
|
