| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] must [verb] been some | 12 |
|
| 2 | [pers pn] must have [been] some | 12 |
|
| 3 | [pers pn] must [vb infin] [been] some | 12 |
|
| 4 | it must [verb] [been] some | 12 |
|
| 5 | [pers pn] must have [been] some | 11 |
|
