| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] must [be] at | 59 |
|
| 2 | [noun] must be at | 59 |
|
| 3 | [noun sg] must [be] at | 35 |
|
| 4 | [noun pl] must [be] at | 17 |
|
| 5 | [noun prp] must [be] at | 6 |
|
