| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [be] [vb pp] [prep] | 17986 |
|
| 2 | must [be] [vb pp] [prep] | 4919 |
|
| 3 | must [adv] [be] [vb pp] | 1540 |
|
| 4 | must [adv] [be] [prep] | 118 |
|
