| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [verb] been [adv] | 576 |
|
| 2 | [verb] been [adv] for | 505 |
|
| 3 | must [verb] [adv] for | 51 |
|
| 4 | must [verb] been for | 14 |
|
