| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] [prep] a [adj] period | 70 |
|
| 2 | be [vb pp] [prep] a short [noun] | 42 |
|
| 3 | be [vb pp] [prep] a short [noun sg] | 41 |
|
| 4 | be [vb pp] [prep] a short period | 17 |
|
| 5 | [be] [vb pp] [prep] a short period | 17 |
|
| 6 | be [vb pp] [prep] [art] short period | 14 |
|
| 7 | be [vb pp] [prep] [art] short period | 14 |
|
| 8 | [be] [vb pp] [prep] a short period | 12 |
|
| 9 | be [verb] [prep] a short period | 12 |
|
| 10 | be [vb pp] [prep] a short period | 12 |
|
| 11 | be [vb pp] [prep] a short period | 12 |
|
| 12 | be [vb pp] [prep] a short period | 12 |
|
