| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [adv] have been | 176 |
|
| 2 | [modal v] already have been | 74 |
|
| 3 | must already [verb] been | 15 |
|
| 4 | must already have be | 15 |
|
| 5 | must already have [be] | 15 |
|
| 6 | must already have [been] | 15 |
|
