| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [vb pp] at [noun sg] | 552 |
|
| 2 | must [be] [vb pp] at | 229 |
|
| 3 | must [be] [vb pp] [noun sg] | 39 |
|
| 4 | must [be] at [noun sg] | 13 |
|
