| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] [modal v] have been | 4393 |
|
| 2 | [noun] must have been | 928 |
|
| 3 | [noun sg] must have be | 549 |
|
| 4 | [noun sg] must have [be] | 549 |
|
| 5 | [noun sg] must have [been] | 546 |
|
| 6 | [noun sg] must [verb] been | 546 |
|
