| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] must [vb infin] been a [noun] | 32 |
|
| 2 | [noun] must have been a [noun] | 32 |
|
| 3 | [noun] must have been a [noun] | 32 |
|
| 4 | [noun] must [verb] been a [noun sg] | 31 |
|
| 5 | [noun sg] must [verb] been a [noun] | 23 |
|
| 6 | [noun pl] must [verb] been a [noun] | 5 |
|
