| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been [vb pp] [prep] a | 5754 |
|
| 2 | to have been [vb pp] [prep] | 1532 |
|
| 3 | to have [vb pp] [prep] a | 187 |
|
| 4 | to have been [vb pp] a | 21 |
|
| 5 | to have been [prep] a | 19 |
|
