| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [indef pn] must have [vb pp] | 113 |
|
| 2 | [indef pn] must have [verb] | 113 |
|
| 3 | [pron] must have seen | 97 |
|
| 4 | [indef pn] [modal v] have seen | 23 |
|
| 5 | [indef pn] must [verb] seen | 13 |
|
| 6 | [indef pn] must have see | 13 |
|
| 7 | [indef pn] must have seen | 13 |
|
| 8 | [indef pn] must [vb infin] seen | 13 |
|
