| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have [verb] | 4562 |
|
| 2 | must have [vb pp] | 4527 |
|
| 3 | [modal v] have seen | 702 |
|
| 4 | must [vb infin] seen | 144 |
|
| 5 | must [verb] seen | 144 |
|
| 6 | must have seen | 142 |
|
| 7 | must have see | 139 |
|
