| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been [vb pp] [prep] a [noun] | 3298 |
|
| 2 | be [vb pp] [prep] a period | 166 |
|
| 3 | [be] [vb pp] [prep] a period | 166 |
|
| 4 | been [vb pp] [prep] [art] period | 38 |
|
| 5 | been [vb pp] [prep] [art] period | 38 |
|
| 6 | been [verb] [prep] a period | 27 |
|
| 7 | been [vb pp] [prep] a period | 25 |
|
| 8 | [been] [vb pp] [prep] a period | 25 |
|
| 9 | been [vb pp] [prep] a period | 25 |
|
