| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [vb infin] [prep] | 4043 |
|
| 2 | must [vb infin] [prep] | 4043 |
|
| 3 | [modal v] [vb infin] by | 1646 |
|
| 4 | must [vb infin] by | 87 |
|
| 5 | must [verb] by | 87 |
|
