| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [indef pn] must have seen | 13 |
|
| 2 | [indef pn] must [verb] seen | 13 |
|
| 3 | [indef pn] must have seen | 13 |
|
| 4 | [indef pn] must [vb infin] seen | 13 |
|
| 5 | someone must [verb] seen | 7 |
|
| 6 | somebody must [verb] seen | 6 |
|
