| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [vb pp] [prep] [art] | 53658 |
|
| 2 | must [be] [vb pp] [prep] | 4919 |
|
| 3 | must [be] [prep] [art] | 382 |
|
| 4 | must [be] [vb pp] [art] | 160 |
|
