| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [vb infin] [vb pp] at the [noun] | 9 |
|
| 2 | must [vb infin] [verb] at the [noun] | 9 |
|
| 3 | must have [verb] at the [noun] | 9 |
|
| 4 | must [vb infin] [verb] at the [noun sg] | 8 |
|
