| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] been [vb pp] for | 3821 |
|
| 2 | must [verb] been [vb pp] | 496 |
|
| 3 | must [verb] [vb pp] for | 38 |
|
| 4 | must [verb] been for | 14 |
|
