| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have [verb] | 4562 |
|
| 2 | must have [vb pp] | 4527 |
|
| 3 | [modal v] have noticed | 233 |
|
| 4 | must have noticed | 30 |
|
| 5 | must [vb infin] noticed | 30 |
|
| 6 | must have notice | 30 |
|
| 7 | must [verb] noticed | 30 |
|
