| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] be [vb pp] [prep] a period | 31 |
|
| 2 | [modal v] be [vb pp] [prep] a period | 31 |
|
| 3 | [modal v] be [vb pp] over a [noun sg] | 29 |
|
| 4 | [modal v] be [vb pp] over a [noun] | 29 |
|
| 5 | [modal v] be [vb pp] over [art] period | 11 |
|
| 6 | [modal v] be [vb pp] over [art] period | 11 |
|
| 7 | [modal v] be [vb pp] over a period | 7 |
|
| 8 | [modal v] [be] [vb pp] over a period | 7 |
|
| 9 | [modal v] be [vb pp] over a period | 7 |
|
| 10 | [modal v] be [vb pp] over a period | 7 |
|
| 11 | [modal v] be [verb] over a period | 7 |
|
