| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [vb pp] at [det] [noun sg] | 401 |
|
| 2 | must [be] [vb pp] at [det] | 45 |
|
| 3 | must [be] [vb pp] [det] [noun sg] | 26 |
|
| 4 | must [be] [vb pp] at [noun sg] | 15 |
|
