| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have [verb] | 4562 |
|
| 2 | [modal v] have know | 706 |
|
| 3 | [vb mod] have know | 706 |
|
| 4 | must [verb] know | 203 |
|
| 5 | must [vb infin] know | 203 |
|
| 6 | must have know | 196 |
|
| 7 | must have know | 195 |
|
