| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [vb infin] [prep] [art] | 1429 |
|
| 2 | must [vb infin] [prep] [art] | 1429 |
|
| 3 | [modal v] [vb infin] within [art] | 239 |
|
| 4 | must [vb infin] within [art] | 26 |
|
| 5 | must [vb infin] within [art] | 26 |
|
| 6 | must [verb] within [art] | 26 |
|
