| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [vb pp] [to-vb] a | 4522 |
|
| 2 | [be] [vb pp] [to-vb] been | 1214 |
|
| 3 | [vb pp] [to-vb] been a | 75 |
|
| 4 | [be] [to-vb] been a | 13 |
|
