| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | he must [vb infin] been a [noun] | 12 |
|
| 2 | he must [verb] been a [noun sg] | 12 |
|
| 3 | he must [verb] been a [noun] | 12 |
|
| 4 | he must have been a [noun] | 12 |
|
| 5 | he must have been a [noun] | 12 |
|
