| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [verb] at [noun] | 1504 |
|
| 2 | must be [verb] at | 249 |
|
| 3 | must be [verb] [noun] | 122 |
|
| 4 | must [verb] at [noun] | 28 |
|
| 5 | must be at [noun] | 16 |
|
