| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] [prep] a period of | 132 |
|
| 2 | be [vb pp] [prep] a period of | 132 |
|
| 3 | be [vb pp] over a [noun] of | 83 |
|
| 4 | be [vb pp] over a [noun sg] of | 81 |
|
| 5 | be [vb pp] over [art] period of | 42 |
|
| 6 | be [vb pp] over [art] period of | 42 |
|
| 7 | be [vb pp] over a period [prep] | 41 |
|
| 8 | be [vb pp] over a period of | 40 |
|
| 9 | [be] [vb pp] over a period of | 40 |
|
| 10 | be [vb pp] over a period of | 40 |
|
| 11 | be [vb pp] over a period of | 40 |
|
| 12 | be [verb] over a period of | 40 |
|
