| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [verb] been [adv] | 576 |
|
| 2 | [verb] been [adv] [det] | 550 |
|
| 3 | must [verb] [adv] [det] | 121 |
|
| 4 | must [verb] been [det] | 93 |
|
