| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [verb] been | 21577 |
|
| 2 | [vb mod] [verb] been | 21577 |
|
| 3 | must [verb] [be] | 3545 |
|
| 4 | must [verb] be | 3545 |
|
| 5 | must [verb] been | 3430 |
|
| 6 | must [verb] [been] | 3430 |
|
