| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have [vb pp] [adv] | 519 |
|
| 2 | [modal v] have [vb pp] down | 116 |
|
| 3 | must [vb infin] [vb pp] down | 20 |
|
| 4 | must [verb] [vb pp] down | 20 |
|
| 5 | must have [vb pp] down | 20 |
|
| 6 | must have [verb] down | 18 |
|
