| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [vb infin] [verb] [noun] | 374 |
|
| 2 | [vb infin] [verb] at [noun] | 229 |
|
| 3 | must [vb infin] [verb] at | 64 |
|
| 4 | must [vb infin] at [noun] | 28 |
|
| 5 | must [verb] at [noun] | 28 |
|
