| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] been [adv] [prep] | 1962 |
|
| 2 | must [verb] [adv] [prep] | 671 |
|
| 3 | must [verb] been [adv] | 576 |
|
| 4 | must [verb] been [prep] | 294 |
|
