| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [vb infin] [pron] [verb] | 516 |
|
| 2 | [modal v] [vb infin] [pron] know | 277 |
|
| 3 | must [vb infin] [pron] [vb infin] | 55 |
|
| 4 | must [vb infin] [pron] know | 11 |
|
| 5 | must [verb] [pron] know | 7 |
|
