| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [verb] been [adv] | 535 |
|
| 2 | [adv] [verb] been [adv] | 404 |
|
| 3 | must [adv] [verb] been | 153 |
|
| 4 | must [adv] [verb] [adv] | 93 |
|
