| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [vb infin] the [num ord] | 24 |
|
| 2 | must [verb] the [num ord] | 24 |
|
| 3 | must [verb] the first | 12 |
|
| 4 | must [verb] the last | 7 |
|
