| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have [verb] a | 342 |
|
| 2 | must have [vb pp] a | 342 |
|
| 3 | [modal v] have done a | 47 |
|
| 4 | [vb mod] have done a | 47 |
|
| 5 | must have done [art] | 12 |
|
| 6 | must have done [art] | 12 |
|
| 7 | must have done a | 7 |
|
| 8 | must have done a | 6 |
|
| 9 | must have done a | 6 |
|
| 10 | must have do a | 6 |
|
| 11 | must [verb] done a | 6 |
|
| 12 | must [vb infin] done a | 6 |
|
