| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] must [vb infin] been one | 8 |
|
| 2 | [noun sg] must have been one | 8 |
|
| 3 | [noun sg] must [verb] been one | 8 |
|
| 4 | [noun sg] must have been one | 8 |
|
