| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | to be [vb pp] [prep] a [noun] | 1980 |
|
| 2 | to be [vb pp] [prep] a [noun sg] | 1872 |
|
| 3 | to be [vb pp] [prep] [art] period | 23 |
|
| 4 | to be [vb pp] [prep] [art] period | 23 |
|
| 5 | to be [verb] [prep] a period | 19 |
|
| 6 | to be [vb pp] [prep] a period | 17 |
|
| 7 | to be [vb pp] [prep] a period | 17 |
|
| 8 | to be [vb pp] [prep] a period | 17 |
|
| 9 | [prep] be [vb pp] [prep] a period | 17 |
|
| 10 | to [be] [vb pp] [prep] a period | 17 |
|
| 11 | to be [vb pp] [prep] a period | 17 |
|
| 12 | to [be] [vb pp] [prep] a period | 17 |
|
