| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [coord] [modal v] have been | 348 |
|
| 2 | [conj] must have been | 89 |
|
| 3 | [coord] must have be | 58 |
|
| 4 | [coord] must [verb] been | 58 |
|
| 5 | [coord] must have [been] | 58 |
|
| 6 | [coord] must have [be] | 58 |
|
