| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [vb pp] at [art] [noun] | 55 |
|
| 2 | [modal v] be [vb pp] at [art] time | 55 |
|
| 3 | must be [vb pp] at [art] [noun sg] | 53 |
|
| 4 | must be [vb pp] [prep] [art] time | 14 |
|
| 5 | must be [vb pp] [prep] [art] time | 14 |
|
| 6 | must be [vb pp] at [art] time | 11 |
|
| 7 | must be [verb] at [art] time | 11 |
|
| 8 | must be [vb pp] at [art] time | 11 |
|
| 9 | must [be] [vb pp] at [art] time | 11 |
|
| 10 | must [be] [vb pp] at [art] time | 11 |
|
| 11 | must be [vb pp] at [art] time | 11 |
|
