| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have [verb] | 4562 |
|
| 2 | must have [vb pp] | 4527 |
|
| 3 | [modal v] have heard | 330 |
|
| 4 | [vb mod] have heard | 330 |
|
| 5 | must [vb infin] heard | 76 |
|
| 6 | must [verb] heard | 76 |
|
| 7 | must have heard | 76 |
|
| 8 | must have heard | 75 |
|
| 9 | must have hear | 75 |
|
