| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [be] [vb pp] [prep] [art] | 2033 |
|
| 2 | [num] must [be] [vb pp] [prep] | 31 |
|
| 3 | [num] [be] [vb pp] [prep] [art] | 29 |
|
