| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [verb] been [adv] | 535 |
|
| 2 | [verb] been [adv] for | 314 |
|
| 3 | must [verb] [adv] for | 27 |
|
| 4 | must [verb] been for | 14 |
|
