| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have [verb] [adv] | 316 |
|
| 2 | must have [vb pp] [adv] | 312 |
|
| 3 | [modal v] have known [adv] | 86 |
|
| 4 | must have known [adv] | 17 |
|
| 5 | must [vb infin] known [adv] | 10 |
|
| 6 | must have known [adv] | 10 |
|
| 7 | must have know [adv] | 10 |
|
| 8 | must [verb] known [adv] | 10 |
|
